Income Taxes (Details 6) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of unrecognized income tax benefits
Unrecognized tax benefits, beginning of year	$ 127	$ 131	$ 119
Additions for income tax positions related to current year	0	0	2
Additions for income tax positions related to prior year	0	0	10
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	(2)	0	0
Reductions for income tax positions related to settlements	6	4	0
Unrecognized tax benefits, end of year	119	127	131
Unrecognized tax benefits that, if recognized, would impact the effective tax rate	119	127	$ 131
Accrued interest and penalties	$ 6	$ 3