Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	$ 1,239	$ 1,922
Gross Amounts Offset in the Consolidated Statements of Financial Position	(965)	(1,489)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	274	433
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(1,357)	(2,169)
Gross Amounts Offset in the Consolidated Statements of Financial Position	1,037	1,512
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(320)	(657)
Natural gas
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	500	744
Gross Amounts Offset in the Consolidated Statements of Financial Position	(382)	(649)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	118	95
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(589)	(1,018)
Gross Amounts Offset in the Consolidated Statements of Financial Position	419	645
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(170)	(373)
Electricity
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	510	963
Gross Amounts Offset in the Consolidated Statements of Financial Position	(358)	(643)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	152	320
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(521)	(935)
Gross Amounts Offset in the Consolidated Statements of Financial Position	381	665
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(140)	(270)
Environmental & Other
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	226	213
Gross Amounts Offset in the Consolidated Statements of Financial Position	(225)	(196)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	1	17
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(239)	(214)
Gross Amounts Offset in the Consolidated Statements of Financial Position	237	201
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(2)	(13)
Interest rate contracts
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	1	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	1	1
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(5)	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	(5)	0
Foreign currency exchange contracts
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	2	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	2	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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