Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	$ 1,197	$ 1,922
Gross Amounts Offset in the Consolidated Statements of Financial Position	(791)	(1,489)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	406	433
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(1,172)	(2,169)
Gross Amounts Offset in the Consolidated Statements of Financial Position	863	1,512
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(309)	(657)
Natural gas
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	637	744
Gross Amounts Offset in the Consolidated Statements of Financial Position	(416)	(649)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	221	95
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(615)	(1,018)
Gross Amounts Offset in the Consolidated Statements of Financial Position	429	645
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(186)	(373)
Electricity
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	421	963
Gross Amounts Offset in the Consolidated Statements of Financial Position	(243)	(643)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	178	320
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(388)	(935)
Gross Amounts Offset in the Consolidated Statements of Financial Position	297	665
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(91)	(270)
Environmental & Other
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	139	213
Gross Amounts Offset in the Consolidated Statements of Financial Position	(132)	(196)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	7	17
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(150)	(214)
Gross Amounts Offset in the Consolidated Statements of Financial Position	137	201
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(13)	(13)
Interest rate contracts
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	0	1
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	0	1
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(16)	0
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	0
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(16)	0
Foreign currency exchange contracts
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	0	1
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	(1)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	0	0
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(3)	(2)
Gross Amounts Offset in the Consolidated Statements of Financial Position	0	1
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	$ (3)	$ (1)

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