Asset Retirement Obligations - Schedule of Asset Retirement Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance, liability	$ 2,538	$ 2,437
Accretion	170	88
Adjustment for change in estimates	90	94
Adjustment for obligations assumed through acquisition	1,368
Payments	(88)	(81)
Ending balance, liability	4,078	2,538
Additions:
Accretion	170	88
Adjustment for change in estimates	90	94
Adjustment for obligations assumed through acquisition	1,368
Reductions:
Payments	(88)	(81)
Less amounts due currently	(142)	(124)
Noncurrent liability at December 31, 2024	3,936	2,414
Asset retirement obligation, non-cash additions, asset retirement costs	52	67
Nuclear Plant Decommissioning
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance, liability	1,742	1,688
Accretion	130	54
Adjustment for change in estimates	0	0
Adjustment for obligations assumed through acquisition	1,368
Payments	0	0
Ending balance, liability	3,240	1,742
Additions:
Accretion	130	54
Adjustment for change in estimates	0	0
Adjustment for obligations assumed through acquisition	1,368
Reductions:
Payments	0	0
Less amounts due currently	0
Noncurrent liability at December 31, 2024	3,240
Increase (decrease) in regulatory liabilities	56
Nuclear Plant Decommissioning | Operating Expense
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Accretion	74
Additions:
Accretion	74
Land Reclamation, Coal Ash and Other
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance, liability	796	749
Accretion	40	34
Adjustment for change in estimates	90	94
Adjustment for obligations assumed through acquisition	0
Payments	(88)	(81)
Ending balance, liability	838	796
Additions:
Accretion	40	34
Adjustment for change in estimates	90	94
Adjustment for obligations assumed through acquisition	0
Reductions:
Payments	(88)	$ (81)
Less amounts due currently	(142)
Noncurrent liability at December 31, 2024	$ 696