Income Tax (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits
Balance at January 1,	$ 19	$ 35	$ 35
Additions for tax positions of prior years	0	6	0
Reductions for tax positions of prior years	0	0	0
Additions for tax positions of current year	0	0	0
Reductions for tax positions of current year	0	0	0
Settlements with tax authorities	0	0	0
Lapses of statutes of limitations	0	(22)	0
Balance at December 31,	19	19	35
Unrecognized tax benefits that, if recognized would impact the effective rate	$ 19	$ 19	$ 35