Income Taxes (Reconciliation of Beginning and Ending Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits
Balance at beginning of year	$ 74	$ 64	$ 85
Additions for tax positions of prior years	40	12	32
Reductions for tax positions due to lapse of statutes of limitations	(5)	0	0
Reductions for tax positions of prior years	(23)	(2)	(16)
Tax settlements	(33)	0	(37)
Balance at end of year	$ 53	$ 74	$ 64