Income Taxes (Unrecognized tax benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns, Net [Roll Forward]
Balance at January 1	$ 16	$ 13	$ 12
Additions for tax positions related to the current year	3	1	2
Additions for tax positions of prior years	8	7	0
Settlements	(1)	(5)	(1)
Balance at December 31	$ 26	$ 16	$ 13