Amounts reclassified from AOCL (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	$ 337	$ 290	$ 658	$ 538
Selling, general and administrative	(93)	(88)	(185)	(167)
Income before income taxes	222	146	413	273
Income tax	(48)	(51)	(88)	(95)
Total reclassifications, net of tax	174	95	325	178
Reclassified from AOCL | Prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	3	1	6	2
Selling, general and administrative	1		1
Reclassified from AOCL | Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Income before income taxes	4	1	7	2
Income tax	(2)	$ (1)	(2)	(1)
Total reclassifications, net of tax	$ 2		$ 5	$ 1