Segment Information - Operating Income to Income Before Income Taxes Reconciliation (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	$ 503	$ 382	$ 1,236	$ 1,193
Net interest expense	(13)	(11)	(51)	(34)
Other (income) expense, net	9	(1)	(8)	(45)
Income before income taxes	481	372	1,193	1,204
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	895	925	2,574	2,667
Corporate and Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	$ (392)	$ (543)	$ (1,338)	$ (1,474)