Accumulated Other Comprehensive Income (Loss) Activity, Net of Tax (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		$ 1,852
Other comprehensive income activity before reclassifications		23
Reclassification of foreign currency translation adjustments realized upon disposal of business	$ (7)	(1)
Ending Balance	2,042	2,042
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(67)
Other comprehensive income activity before reclassifications		24
Reclassification of foreign currency translation adjustments realized upon disposal of business		(1)
Ending Balance	(44)	(44)
Change in Deferred Pension and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(62)
Other comprehensive income activity before reclassifications		(1)
Ending Balance	(63)	(63)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(129)
Ending Balance	$ (107)	$ (107)