Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	$ 891	$ 1,197
Gross Amounts Offset in the Consolidated Statements of Financial Position	(643)	(791)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	248	406
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(935)	(1,172)
Gross Amounts Offset in the Consolidated Statements of Financial Position	690	863
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(245)	(309)
Natural gas
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	499	637
Gross Amounts Offset in the Consolidated Statements of Financial Position	(346)	(416)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	153	221
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(506)	(615)
Gross Amounts Offset in the Consolidated Statements of Financial Position	371	429
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(135)	(186)
Electricity
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	235	421
Gross Amounts Offset in the Consolidated Statements of Financial Position	(155)	(243)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	80	178
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(267)	(388)
Gross Amounts Offset in the Consolidated Statements of Financial Position	167	297
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(100)	(91)
Environmental & Other
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	146	139
Gross Amounts Offset in the Consolidated Statements of Financial Position	(142)	(132)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	4	7
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(161)	(150)
Gross Amounts Offset in the Consolidated Statements of Financial Position	152	137
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(9)	(13)
Interest rate contracts
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	10	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	10	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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