Financial and Other Derivative Instruments ( Netting Offsets of Derivative Assets and Liabilities Reconciliation to the Statements of Financial Position) (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Derivative Assets
Derivative Assets	$ 1,056	$ 707
Collateral adjustment	(23)	(35)
Total derivatives assets as reported, current	166	143
Total derivatives assets as reported, noncurrent	142	89
Derivative Liabilities
Derivative Liabilities	(962)	(597)
Collateral adjustment	32	5
Total derivatives liabilities as reported, current	(147)	(86)
Total derivatives liabilities as reported, noncurrent	(58)	(66)
Balance Sheet Location [Axis]: us-gaap:DerivativeAssetsCurrent
Derivative Assets
Derivative Assets	732	482
Counterparty netting	(551)	(325)
Collateral adjustment	(15)	(14)
Balance Sheet Location [Axis]: us-gaap:DerivativeAssetsNoncurrent
Derivative Assets
Derivative Assets	324	225
Counterparty netting	(174)	(115)
Collateral adjustment	(8)	(21)
Balance Sheet Location [Axis]: us-gaap:DerivativeLiabilitiesCurrent
Derivative Liabilities
Derivative Liabilities	(708)	(413)
Counterparty netting	551	325
Collateral adjustment	10	2
Balance Sheet Location [Axis]: us-gaap:DerivativeLiabilitiesNoncurrent
Derivative Liabilities
Derivative Liabilities	(254)	(184)
Counterparty netting	174	115
Collateral adjustment	$ 22	$ 3