Derivatives - Schedule of Pretax Effect on Net Income of Derivatives Not Under Hedge Accounting, Including Realized and Unrealized Effects (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Total reversals of previously recognized unrealized (gain) loss on derivative instruments	$ 955	$ 1,172	$ 1,565
Total unrealized net gain (loss) from change in fair value on derivative instruments	(1,830)	36	(1,111)
Net unrealized gain (loss) on derivative instruments	(875)	1,208	454
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Total reversals of previously recognized unrealized (gain) loss on derivative instruments	(15)	(41)	(78)
Total unrealized net gain (loss) from change in fair value on derivative instruments	(52)	94	42
Operating revenues \| Commodity Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total reversals of previously recognized unrealized (gain) loss on derivative instruments	1,045	1,140	1,472
Total unrealized net gain (loss) from change in fair value on derivative instruments	(1,811)	(127)	(758)
Fuel, purchased power costs, and delivery fees/Depreciation and amortization \| Commodity Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total reversals of previously recognized unrealized (gain) loss on derivative instruments	(75)	73	171
Total unrealized net gain (loss) from change in fair value on derivative instruments	$ 33	$ 69	$ (395)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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