Income Taxes (Components of Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Federal:
Current	$ 7	$ 0	$ 2
Deferred	186	545	(361)
State:
Current	2	0	1
Deferred	5	1	(4)
Foreign:
Current	378	335	318
Deferred	130	109	76
Total	$ 708	$ 990	$ 32