Income Taxes (Schedule of Unrecognized Tax Benefits Roll Forward) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 53	$ 48	$ 44
Additions based on tax positions related to the current year	0	0	0
Additions for tax positions of prior years	7	5	11
Reductions for tax positions of prior years	(7)	0	(5)
Settlements	0	0	(2)
Expiration of statute of limitations	0	0	0
Balance at December 31	53	53	48
Unrecognized tax benefits that would impact effective tax rate	42	42	38
Unrecognized tax benefits, income tax penalties and interest accrued	1	1	1
Unrecognized tax benefits, income tax penalties and interest expense	1	$ 1	$ 1
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit	$ 52