Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	$ 1,922	$ 1,391
Gross Amounts Offset in the Consolidated Statements of Financial Position	(1,489)	(1,120)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	433	271
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(2,169)	(1,508)
Gross Amounts Offset in the Consolidated Statements of Financial Position	1,512	1,078
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(657)	(430)
Natural gas
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	744	454
Gross Amounts Offset in the Consolidated Statements of Financial Position	(649)	(394)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	95	60
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(1,018)	(594)
Gross Amounts Offset in the Consolidated Statements of Financial Position	645	347
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(373)	(247)
Electricity
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	963	643
Gross Amounts Offset in the Consolidated Statements of Financial Position	(643)	(441)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	320	202
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(935)	(622)
Gross Amounts Offset in the Consolidated Statements of Financial Position	665	443
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(270)	(179)
Environmental & Other
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	213	294
Gross Amounts Offset in the Consolidated Statements of Financial Position	(196)	(285)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	17	9
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(214)	(288)
Gross Amounts Offset in the Consolidated Statements of Financial Position	201	288
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(13)	0
Interest rate 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
Foreign currency exchange contracts
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	1	0
Gross Amounts Offset in the Consolidated Statements of Financial Position	(1)	0
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	0	0
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(2)	(4)
Gross Amounts Offset in the Consolidated Statements of Financial Position	1	0
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	$ (1)	$ (4)

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