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Document and Entity Information - USD ($) $ in Billions	12 Months Ended
Document and Entity Information - USD ($) $ in Billions	Dec. 31, 2014	Feb. 24, 2015	Jun. 30, 2014
Document and Entity Information
Entity Registrant Name	TC PIPELINES LP
Entity Central Index Key	0001075607
Document Type	10-K
Document Period End Date	Dec. 31, 2014
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 2.3
Entity Common Stock, Shares Outstanding		63,561,546
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY

CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Millions

Dec. 31, 2014

Dec. 31, 2013

Current Assets

Cash and cash equivalents

$ 26

$ 25

^[1]

Accounts receivable and other (Note 19)

Inventories

Total current assets

Investments in unconsolidated affiliates (Note 4)

1,177

1,195

Plant, property and equipment (Note 5)

1,968

2,042

Goodwill

130

Other assets

Total assets

3,349

3,443

Current Liabilities

Accounts payable and accrued liabilities

Accounts payable to affiliates (Note 16)

Accrued interest

Short-term loan (Note 7)

170

Current portion of long-term debt (Note 7)

Total current liabilities

291

Long-term debt (Note 7)

1,446

1,575

Other liabilities (Note 8)

Total liabilities

1,763

1,654

Partners' Equity (Note 9)

Common units

1,325

1,322

General partner

Accumulated other comprehensive loss (Note 10)

(2)

(1)

Controlling interests

1,352

1,349

Non-controlling interests

234

440

Total partners' equity

1,586

1,789

Total liabilities and partners' equity

$ 3,349

$ 3,443

[1]	Recast as discussed in Note 2 and Note 6.

CONSOLIDATED STATEMENTS OF INCOME
shares in Millions, $ in Millions

12 Months Ended

Dec. 31, 2014

USD ($)

$ / shares

Dec. 31, 2013

USD ($)

$ / shares

Dec. 31, 2012

USD ($)

$ / shares

CONSOLIDATED STATEMENTS OF INCOME

Transmission revenues

$ 336

$ 341

^[1]

$ 343

^[1]

Equity earnings from unconsolidated affiliates (Note 4)

^[1]

Operation and maintenance expenses

(54)

(55)

^[1]

(57)

^[1]

Property taxes

(21)

(23)

^[1]

(25)

^[1]

General and administrative

(9)

^[1]

(6)

^[1]

Depreciation

(86)

^[1]

(85)

^[1]

Financial charges and other (Note 11)

(50)

(44)

^[1]

(40)

^[1]

Net income

204

191

^[1]

229

^[1]

Net income attributable to non-controlling interests

^[1]

Net income attributable to controlling interests

172

155

^[1]

192

^[1]

Net income attributable to controlling interests allocation (Note 12)

Common units

168

126

^[1]

134

^[1]

General Partner

^[1]

Net income allocated to controlling interests

$ 172

$ 129

^[1]

$ 137

^[1]

Net income per common unit (Note 12) - basic (in dollars per unit) | $ / shares

$ 2.67

$ 2.13

$ 2.51

Net income per common unit (Note 12) - diluted (in dollars per unit) | $ / shares

$ 2.67

$ 2.13

$ 2.51

Weighted average common units outstanding (millions) - basic (in units) | shares

62.7

58.9

53.5

Weighted average common units outstanding (millions) - diluted (in units) | shares

62.7

58.9

53.5

Common units outstanding, end of year (millions) (in units) | shares

63.6

62.3

53.5

[1]	Recast as discussed in Note 2 and Note 6.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

^[1]

Dec. 31, 2012

^[1]

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

Net income

$ 204

$ 191

$ 229

Other comprehensive income

Change in fair value of cash flow hedges (Note 18)

(1)

Reclassification to net income of gains and losses on cash flow hedges (Note 10)

Other comprehensive income

(1)

Total comprehensive income

203

191

229

Comprehensive income attributable to non-controlling interests

Comprehensive income attributable to controlling interests

$ 171

$ 155

$ 192

[1]	Recast as discussed in Note 2 and Note 6.

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2014

Dec. 31, 2013

Dec. 31, 2012

Cash Generated From Operations

Net income

$ 204

$ 191

^[1]

$ 229

^[1]

Depreciation

^[1]

Amortization of debt issue costs (Note 11)

^[1]

Change in other long-term liabilities

^[1]

Change in operating working capital (Note 14)

(8)

^[1]

Total cash generated from operations

308

272

^[1]

315

^[1]

Investing Activities

Adjustment to the 2011 Acquisition

^[1]

Capital expenditures

(10)

(15)

^[1]

(36)

^[1]

Change in affiliate demand loan receivable

^[1]

Total investing activities

(234)

(920)

^[1]

Financing Activities

Distributions paid (Note 13)

(212)

(188)

^[1]

(169)

^[1]

Distributions paid to non-controlling interests

(50)

(52)

^[1]

(53)

^[1]

Change in affiliate demand loan payable

^[1]

(15)

Long-term debt issued (Note 7)

937

^[1]

Short-term loan issued (Note 7)

170

Long-term debt repaid (Note 7)

(89)

(372)

^[1]

(62)

^[1]

Debt issue costs

^[1]

(2)

Equity contribution from Bison's former parent (Note 16)

^[1]

Distributions paid to former parent of GTN and Bison

^[1]

(37)

(81)

Total financing activities

(73)

670

^[1]

(357)

^[1]

Increase/(decrease) in cash and cash equivalents

^[1]

(26)

^[1]

Cash and cash equivalents, beginning of year

^[1]

Cash and cash equivalents, end of year

^[1]

Interest payments made

^[1]

Supplemental information about non-cash investing and financing activities

Accrual for Carty Lateral consideration payment (Note 16)

^[1]

ATM Equity Issuance Program

Financing Activities

Equity issuance, net (Note 9)

Equity Issuance, May 2013

Financing Activities

Equity issuance, net (Note 9)

^[1]

381

GTN and Bison

Investing Activities

Acquisition of additional interests, net of cash acquired (Note 6)

^[1]

(921)

GTN

Investing Activities

Acquisition of interest

(25)

Bison

Investing Activities

Acquisition of remaining 30 percent interest

(217)

Great Lakes

Investing Activities

Cumulative distributions in excess of equity earnings

^[1]

Investment in unconsolidated affiliate (Note 4)

(9)

^[1]

(9)

^[1]

Northern Border

Investing Activities

Cumulative distributions in excess of equity earnings

$ 18

^[1]

$ 24

^[1]

Investment in unconsolidated affiliate (Note 4)

^[1]

$ (31)

[1]	Recast as discussed in Note 2 and Note 6.

CONSOLIDATED STATEMENT OF CHANGES IN PARTNERS' EQUITY - USD ($)
shares in Millions, $ in Millions