Income Taxes (Components of Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Federal:
Current	$ 9	$ 0	$ (28)
Deferred	(56)	(121)	(110)
State:
Current	1	1	1
Deferred	(5)	1	1
Foreign:
Current	505	457	509
Deferred	11	81	(30)
Total	$ 465	$ 419	$ 343