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 [Roll Forward]
Beginning balance	$ 97	$ 94	$ 98
Additions, based on tax positions related to current year	6	1	2
Additions for tax positions of prior years	44	15	11
Reductions for tax positions of prior years	(8)	(2)	(1)
Settlements	(8)	(2)	(1)
Lapses in statutes of limitations	(7)	(9)	(15)
Ending balance	$ 124	$ 97	$ 94