Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	$ 2,754	$ 1,391
Gross Amounts Offset in the Consolidated Statements of Financial Position	(2,236)	(1,120)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	518	271
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(2,996)	(1,508)
Gross Amounts Offset in the Consolidated Statements of Financial Position	2,242	1,078
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(754)	(430)
Natural gas
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	891	454
Gross Amounts Offset in the Consolidated Statements of Financial Position	(852)	(394)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	39	60
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(1,193)	(594)
Gross Amounts Offset in the Consolidated Statements of Financial Position	772	347
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(421)	(247)
Electricity
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	1,622	643
Gross Amounts Offset in the Consolidated Statements of Financial Position	(1,160)	(441)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	462	202
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(1,577)	(622)
Gross Amounts Offset in the Consolidated Statements of Financial Position	1,244	443
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(333)	(179)
Environmental & Other
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	238	294
Gross Amounts Offset in the Consolidated Statements of Financial Position	(224)	(285)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	14	9
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(225)	(288)
Gross Amounts Offset in the Consolidated Statements of Financial Position	226	288
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)	3	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	3	0
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(1)	(4)
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)	$ (4)

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