Income Taxes, Components of Current and Deferred Portions of Provision for Income Taxes on Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current income tax provision [Abstract]
Federal	$ 88	$ 60	$ 78
State and local	10	5	1
Foreign	48	26	35
Subtotal	146	91	114
Deferred income tax provision/(benefit) [Abstract]
Federal	37	(67)	101
State and local	6	(1)	11
Foreign	0	2	1
Subtotal	43	(66)	113
Total provision for income taxes	$ 189	$ 25	$ 227