Asset Retirement Obligations - Schedule of Asset Retirement Obligations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liability at beginning of period	$ 4,078	$ 2,538
Accretion	48	33
Adjustment for change in estimates	(33)	3
Adjustment for obligations assumed through acquisition	0	1,368
Payments	(20)	(17)
Liability at end of period	4,073	3,925
Additions:
Accretion	48	33
Adjustment for change in estimates	(33)	3
Adjustment for obligations assumed through acquisition	0	1,368
Reductions:
Payments	(20)	(17)
Less amounts due currently	(136)	(119)	$ (142)
Noncurrent liability at end of period	3,937	3,806	$ 3,936
Asset retirement obligation, non-cash additions, asset retirement costs	15	1
Nuclear Plant Decommissioning
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liability at beginning of period	3,240	1,742
Accretion	37	23
Adjustment for change in estimates	0	0
Adjustment for obligations assumed through acquisition	0	1,368
Payments	0	0
Liability at end of period	3,277	3,133
Additions:
Accretion	37	23
Adjustment for change in estimates	0	0
Adjustment for obligations assumed through acquisition	0	1,368
Reductions:
Payments	0	0
Less amounts due currently	0	0
Noncurrent liability at end of period	3,277	3,133
Increase (decrease) in regulatory liabilities	14	14
Nuclear Plant Decommissioning | Operating Expense
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Accretion	23	9
Additions:
Accretion	23	9
Land Reclamation, Coal Ash and Other
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liability at beginning of period	838	796
Accretion	11	10
Adjustment for change in estimates	(33)	3
Adjustment for obligations assumed through acquisition	0	0
Payments	(20)	(17)
Liability at end of period	796	792
Additions:
Accretion	11	10
Adjustment for change in estimates	(33)	3
Adjustment for obligations assumed through acquisition	0	0
Reductions:
Payments	(20)	(17)
Less amounts due currently	(136)	(119)
Noncurrent liability at end of period	$ 660	$ 673