Income Taxes (Income Tax Expense From Continuing Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred:
Total deferred	$ 9	$ 8	$ (233)
Provision (benefit) for income taxes	27	37	(242)
Continuing Operations [Member]
Current:
U.S. federal	11	23	(14)
Foreign	2	1	3
State and local	5	6	5
Total current	17	29	(6)
Deferred:
U.S. federal	8	1	(242)
Foreign		1	2
State and local	2	6	4
Total deferred	10	8	(235)
Provision (benefit) for income taxes	$ 27	$ 37	$ (242)