Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Statutory U.S. federal tax expense									$ 175	$ 232	$ 492
Nondeductible expenses									53	44	31
Tax credits, excluding expirations									(49)	(55)	(73)
State and local income taxes, net of federal income tax benefit									30	(4)	77
Valuation allowance change, excluding expirations									(28)	(91)	54
Unrecognized tax benefits									(11)	38	(4)
Tax law enactment									0	(18)	0
Settlement of qualified defined benefit pension plan									0	0	61
Other, net									(3)	(2)	(11)
Total income tax expense from continuing operations	$ 0	$ 67	$ 60	$ 40	$ 10	$ (51)	$ 96	$ 89	$ 167	$ 144	$ 627