Accumulated Other Comprehensive Income (Loss) Activity, Net of Tax (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 2,120
Reclassification of foreign currency translation adjustments realized upon disposal of business	14
Ending Balance	2,157
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(43)
Reclassification of foreign currency translation adjustments realized upon disposal of business	14
Ending Balance	(29)
Change in Deferred Pension and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(35)
Ending Balance	(35)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(78)
Ending Balance	$ (64)