Financial and Other Derivative Instruments (Netting Offsets of Derivative Assets and Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	$ 837	$ 694
Gross Amounts Offset in the Consolidated Statements of Financial Position	(599)	(447)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	238	247
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(758)	(605)
Gross Amounts Offset in the Consolidated Statements of Financial Position	538	430
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(220)	(175)
Natural gas
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	461	428
Gross Amounts Offset in the Consolidated Statements of Financial Position	(327)	(285)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	134	143
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(395)	(410)
Gross Amounts Offset in the Consolidated Statements of Financial Position	280	272
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(115)	(138)
Electricity
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	304	187
Gross Amounts Offset in the Consolidated Statements of Financial Position	(214)	(116)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	90	71
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(310)	(150)
Gross Amounts Offset in the Consolidated Statements of Financial Position	206	114
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(104)	(36)
Environmental & Other
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	68	58
Gross Amounts Offset in the Consolidated Statements of Financial Position	(58)	(46)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	10	12
Derivative liabilities
Gross Amounts of Recognized Assets (Liabilities)	(52)	(44)
Gross Amounts Offset in the Consolidated Statements of Financial Position	52	44
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	0	0
Interest rate contracts
Derivative assets
Gross Amounts of Recognized Assets (Liabilities)	3	20
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	20
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	0
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	1	1
Derivative liabilities
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)

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