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Derivatives and Risk Management Activities - Fair Value (Details) - Recurring Fair Value Measures - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Recurring Fair Value Measurements
Total net derivative asset/(liability)	$ 66	$ 24
Level 1
Recurring Fair Value Measurements
Total net derivative asset/(liability)		11
Level 2
Recurring Fair Value Measurements
Total net derivative asset/(liability)	66	13
Commodity derivatives
Recurring Fair Value Measurements
Total net derivative asset/(liability)	(4)	(3)
Commodity derivatives | Level 1
Recurring Fair Value Measurements
Total net derivative asset/(liability)		11
Commodity derivatives | Level 2
Recurring Fair Value Measurements
Total net derivative asset/(liability)	(4)	(14)
Interest rate derivatives
Recurring Fair Value Measurements
Total net derivative asset/(liability)	29	27
Interest rate derivatives | Level 2
Recurring Fair Value Measurements
Total net derivative asset/(liability)	29	27
Foreign currency derivatives
Recurring Fair Value Measurements
Total net derivative asset/(liability)	41	0
Foreign currency derivatives | Level 1
Recurring Fair Value Measurements
Total net derivative asset/(liability)		0
Foreign currency derivatives | Level 2
Recurring Fair Value Measurements
Total net derivative asset/(liability)	$ 41	$ 0

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- 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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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
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-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

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