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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details) $ in Millions, $ in Billions	3 Months Ended
	Jun. 30, 2025 USD ($) $ / $	Jun. 30, 2025 CAD ($) $ / $	Dec. 31, 2024 USD ($)
Recurring Fair Value Measures
Derivatives and Risk Management Activities
Fair value, liability	$ (7)		$ 24
Foreign currency derivatives
Derivatives and Risk Management Activities
Notional amount of derivatives		$ 4.5
Gain (loss) on derivatives recognized in net income	$ (49)
Average fixed exchange rate (cad per usd) | $ / $	1.37	1.37
Average exchange rate (cad per usd) | $ / $	1.35	1.35
Foreign currency derivatives | Recurring Fair Value Measures
Derivatives and Risk Management Activities
Fair value, liability	$ (49)		$ 0

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- Definition

Derivative, Average Fixed Exchange Rate

+ References

No definition available.

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- Definition

Average contractual rate at which a foreign currency can be purchased or sold.

+ References

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X

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4A
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-Publisher FASB
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-Publisher FASB
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- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
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-Section 25
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-Publisher FASB
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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
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