Income Taxes (Schedule of Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Beginning balance	$ 72	$ 63	$ 56
Additions based on tax positions related to the current year	12	11	10
Additions for tax positions of previous years	15	1	1
Reductions for tax positions of prior years	(1)	(4)	(2)
Reductions due to lapse of statute of limitations	(3)	(1)	(1)
Settlements	0	0	0
Other	(6)	2	(1)
Ending balance	$ 89	$ 72	$ 63