Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Nuclear decommissioning trust	$ 502	$ 443
Property, plant and equipment, net	465	560
Unrealized gain on qualifying derivatives	32	12
Investment in subsidiaries	0	14
Deferred tax liabilities	999	1,029
Less:
Interest limitation carryforward	340	336
Federal net operating loss carryforwards	164	273
Accrued pension costs	80	78
Accrued liabilities	30	26
State net operating loss carryforwards	15	26
Other	8	10
Deferred tax assets	637	749
Valuation allowance	0	(128)
Deferred tax liabilities, net	$ 362	$ 408