Segment and Geographic Area Information - Schedule of Reconciliation of Certain Segment Information to Consolidated Totals (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated sales	$ 5,245	$ 5,573	$ 5,897	$ 5,819	$ 6,377	$ 6,239	$ 5,836	$ 5,454	$ 22,534	$ 23,906	$ 23,032
Operating Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated sales									26,490	28,955	28,067
Intersegment Eliminations [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated sales									(3,982)	(5,057)	(5,034)
Corporate [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Consolidated sales									$ 26	$ 8	$ (1)