Operating Income to Income from Continuing Operations Reconciliation (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total operating income	$ 432	$ 353
Net interest expense	12	14
Other (income) expense, net	(18)	11
Income from continuing operations before income taxes	438	328
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total operating income	834	776
Corporate and Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total operating income	$ (402)	$ (423)