Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	$ 968	$ 1,922
Gross Amounts Offset in the Consolidated Statements of Financial Position	(659)	(1,489)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	309	433
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(970)	(2,169)
Gross Amounts Offset in the Consolidated Statements of Financial Position	671	1,512
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(299)	(657)
Natural gas
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	441	744
Gross Amounts Offset in the Consolidated Statements of Financial Position	(299)	(649)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	142	95
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(476)	(1,018)
Gross Amounts Offset in the Consolidated Statements of Financial Position	301	645
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(175)	(373)
Electricity
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	333	963
Gross Amounts Offset in the Consolidated Statements of Financial Position	(198)	(643)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	135	320
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(318)	(935)
Gross Amounts Offset in the Consolidated Statements of Financial Position	208	665
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(110)	(270)
Environmental & Other
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	171	213
Gross Amounts Offset in the Consolidated Statements of Financial Position	(162)	(196)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	9	17
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(175)	(214)
Gross Amounts Offset in the Consolidated Statements of Financial Position	162	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)	22	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	22	1
Foreign currency exchange contracts
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	1	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	1	0
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(1)	(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	$ (1)	$ (1)

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