Line of Credit Facility, Termination

No definition available.

Name:	trp_LineOfCreditFacilityTermination
Namespace Prefix:	trp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

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-Publisher FASB
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

LONG-TERM DEBT - Retired/Repaid (Details) $ in Millions, $ in Millions	1 Months Ended														12 Months Ended
	Dec. 31, 2022 CAD ($)	Aug. 31, 2022 CAD ($)	Dec. 31, 2021 CAD ($)	Dec. 31, 2021 USD ($)	Nov. 30, 2021 CAD ($)	Nov. 30, 2021 USD ($)	Oct. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jan. 31, 2021 USD ($)	Nov. 30, 2020 CAD ($)	Oct. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CAD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2021 CAD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Long-term debt	$ 1,600		$ 0													$ 0
TRANSCANADA PIPELINES LIMITED \| Medium Term Note due December 2022
Debt Instrument [Line Items]
Amount	$ 25
Interest Rate	9.95%
TRANSCANADA PIPELINES LIMITED \| Senior Unsecured Notes due August 2022
Debt Instrument [Line Items]
Amount		$ 1,000
Interest Rate		2.50%
TRANSCANADA PIPELINES LIMITED \| Medium Term Note due November 2021
Debt Instrument [Line Items]
Amount					$ 500
Interest Rate					3.65%	3.65%
TRANSCANADA PIPELINES LIMITED \| Debentures due January 2021
Debt Instrument [Line Items]
Amount										$ 400
Interest Rate										9.875%
TRANSCANADA PIPELINES LIMITED \| Debentures due November 2020
Debt Instrument [Line Items]
Amount											$ 250
Interest Rate											11.80%
TRANSCANADA PIPELINES LIMITED \| Senior Unsecured Notes due October 2020
Debt Instrument [Line Items]
Amount												$ 1,000
Interest Rate												3.80%
TRANSCANADA PIPELINES LIMITED \| Senior Unsecured Notes due March 2020
Debt Instrument [Line Items]
Amount														$ 750
Interest Rate														4.60%
Amortization of debt Issue costs																8
COLUMBIA PIPELINE GROUP, INC. \| Unsecured Term Loan due December 2021
Debt Instrument [Line Items]
Amount				$ 4,040
COLUMBIA PIPELINE GROUP, INC. \| Senior Unsecured Notes due June 2020
Debt Instrument [Line Items]
Amount													$ 750
Interest Rate													3.30%
COLUMBIA PIPELINE GROUP, INC. \| Unsecured Term Loan due June 2022
Debt Instrument [Line Items]
Amortization of debt Issue costs			$ 5
Debt instrument, face amount																		$ 4,200		$ 4,200
Amount										$ 4,040
NORTH BAJA PIPELINE, LLC \| Unsecured Term Loan due December 2021
Debt Instrument [Line Items]
Amount				$ 50
TC PIPELINES, LP \| Unsecured Term Loan due November 2021
Debt Instrument [Line Items]
Amount						$ 450
TC PIPELINES, LP \| Senior Unsecured Notes due March 2021
Debt Instrument [Line Items]
Amount									$ 350
Interest Rate																			4.65%
TC PIPELINES, LP \| Line of credit \| Project Level Credit Facility due June 2021
Debt Instrument [Line Items]
Terminated amount																			$ 500
Long-term debt																			$ 0
ANR PIPELINE COMPANY \| Senior Unsecured Notes due November 2021
Debt Instrument [Line Items]
Amount						$ 300
Interest Rate					9.625%	9.625%
GREAT LAKES GAS TRANSMISSION LIMITED PARTNERSHIP \| Senior Unsecured Notes due November 2021
Debt Instrument [Line Items]
Amount						$ 10
Interest Rate					9.09%	9.09%
PORTLAND NATURAL GAS TRANSMISSION SYSTEM \| Unsecured Loan Facility due October 2021
Debt Instrument [Line Items]
Amount							$ 93
PORTLAND NATURAL GAS TRANSMISSION SYSTEM \| Unsecured Loan Facility due October 2020
Debt Instrument [Line Items]
Amount												$ 99
KEYSTONE XL SUBSIDIARIES \| Line of credit \| Project Level Credit Facility due June 2021
Debt Instrument [Line Items]
Amount								$ 849
Amount															$ 849	$ 1,028	$ 849
GAS TRANSMISSION NORTHWEST LLC \| Senior Unsecured Notes due June 2020
Debt Instrument [Line Items]
Amount													$ 100
Interest Rate													5.29%