Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	$ 694	$ 1,197
Gross Amounts Offset in the Consolidated Statements of Financial Position	(447)	(791)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	247	406
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(605)	(1,172)
Gross Amounts Offset in the Consolidated Statements of Financial Position	430	863
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(175)	(309)
Natural gas
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	428	637
Gross Amounts Offset in the Consolidated Statements of Financial Position	(285)	(416)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	143	221
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(410)	(615)
Gross Amounts Offset in the Consolidated Statements of Financial Position	272	429
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(138)	(186)
Electricity
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	187	421
Gross Amounts Offset in the Consolidated Statements of Financial Position	(116)	(243)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	71	178
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(150)	(388)
Gross Amounts Offset in the Consolidated Statements of Financial Position	114	297
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(36)	(91)
Environmental & Other
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	58	139
Gross Amounts Offset in the Consolidated Statements of Financial Position	(46)	(132)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	12	7
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(44)	(150)
Gross Amounts Offset in the Consolidated Statements of Financial Position	44	137
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	0	(13)
Interest rate contracts
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	20	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	20	0
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	0	(16)
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	(16)
Foreign currency exchange contracts
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	1	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	1	0
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(1)	(3)
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	$ (1)	$ (3)

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