Income Taxes - Reconciliation Rollforward of Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reconciliation of gross unrecognized tax benefits
Beginning balance	$ 150	$ 138	$ 125
Additions for tax positions related to the current year	22	26	12
Reductions for tax positions related to the current year	(2)	(3)	(1)
Additions for tax positions of prior years	23	80	5
Reductions for tax positions of prior years	(8)	(85)	(1)
Reductions due to lapse of statutes of limitations	(20)	(5)	0
Audit settlements	(1)	(1)	(2)
Ending balance	164	150	138
Unrecognized tax benefits, net of federal tax benefits, that would affect the effective tax rate if recognized	134	120	106
Estimated decrease in gross amount of unrecognized tax benefits reasonably possible in next 12 months	16
Interest and penalties related to unrecognized tax benefits
Interest and penalties expense (credit)	5	12	$ 4
Payable related to accrued interest and penalties	31	26
Estimated CAMT	$ 131	$ 0

Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes.

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