Income Taxes - Schedule of Provision for Income Taxes on Income from Continuing Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 3	$ 9	$ 3
Foreign	421	221	313
State and local	0	0	0
Current provision for income taxes, total	424	230	316
Deferred:
Federal	24		(85)
Foreign	152	(46)	171
State and local	0	0	0
Deferred provision for income taxes, total	176	(46)	86
Provision for income taxes	$ 600	$ 184	$ 402