Income Tax (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
Balance at January 1,	$ 34	$ 34	$ 34
Additions for tax positions of prior years	0	0	0
Reductions for tax positions of prior years	0	0	0
Additions for tax positions of current year	0	0	0
Reductions for tax positions of current year	0	0	0
Settlements with tax authorities	0	0	0
Balance at December 31,	34	34	34
Unrecognized tax benefits that, if recognized would impact the effective rate	$ 34	$ 34	$ 34