Income Taxes - Components of Current and Deferred Portions of Provision for Income Taxes on Continuing Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current income tax provision:
Federal	$ 60	$ 78	$ 159
State and local	5	1	29
Foreign	26	35	39
Subtotal	91	114	227
Deferred income tax provision/(benefit):
Federal	(67)	101	31
State and local	(1)	11	(1)
Foreign	2	1	7
Subtotal	(66)	113	37
Total provision for income taxes	$ 25	$ 227	$ 264