Asset Retirement Obligations - Schedule of Asset Retirement Obligations (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liability at beginning of period	$ 4,078	$ 2,538
Accretion	95	80
Adjustment for change in estimates	(31)	6
Adjustment for obligations assumed through acquisition	0	1,368
Payments	(43)	(39)
Liability at end of period	4,099	3,953
Additions:
Accretion	95	80
Adjustment for change in estimates	(31)	6
Adjustment for obligations assumed through acquisition	0	1,368
Reductions:
Payments	(43)	(39)
Less amounts due currently	(146)	(106)	$ (142)
Noncurrent liability at end of period	3,953	3,847	$ 3,936
Asset retirement obligation, non-cash additions, asset retirement costs	(14)	1
Nuclear Plant Decommissioning
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liability at beginning of period	3,240	1,742
Accretion	75	59
Adjustment for change in estimates	0	0
Adjustment for obligations assumed through acquisition	0	1,368
Payments	0	0
Liability at end of period	3,315	3,169
Additions:
Accretion	75	59
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	3,315	3,169
Increase (decrease) in regulatory liabilities	29	28
Nuclear Plant Decommissioning | Operating Expense
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Accretion	46	31
Additions:
Accretion	46	31
Land Reclamation, Coal Ash and Other
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liability at beginning of period	838	796
Accretion	20	21
Adjustment for change in estimates	(31)	6
Adjustment for obligations assumed through acquisition	0	0
Payments	(43)	(39)
Liability at end of period	784	784
Additions:
Accretion	20	21
Adjustment for change in estimates	(31)	6
Adjustment for obligations assumed through acquisition	0	0
Reductions:
Payments	(43)	(39)
Less amounts due currently	(146)	(106)
Noncurrent liability at end of period	$ 638	$ 678