Summary of Significant Accounting Policies (Additional Information) (Detail) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Advertising costs expensed									$ 280	$ 313	$ 322
Research and development – total									464	472	473
Less depreciation on research facilities									23	21	20
Research and development, net									$ 441	451	453
Number of Operating Segments | Segment									9
Asset retirement obligation	$ 22				$ 19				$ 22	19
Cost of sales, exclusive of depreciation and amortization	2,188	$ 2,253	$ 2,379	$ 2,181	$ 2,120	$ 2,104	$ 2,083	$ 1,902	9,001	8,209	7,665
Selling, general and administrative									3,573	3,554	3,555
Other charges									122	74	242
Income before income taxes									1,693	2,005	779
Reclassifications of Temporary to Permanent Equity									$ 0
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Identifiable intangible assets with finite lives estimated useful lives									1 year
Other Commitment	700								$ 700
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Identifiable intangible assets with finite lives estimated useful lives									30 years
Other Commitment	$ 750								$ 750
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Research and development, net										453	459
Cost of sales, exclusive of depreciation and amortization									8,925	8,207	7,693
Selling, general and administrative									3,682	3,564	3,588
Other charges										64	175
Income before income taxes									1,693	2,005	779
Accounting Standards Update 2017-07 [Member] | Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Research and development, net										(2)	(6)
Cost of sales, exclusive of depreciation and amortization										2	(28)
Selling, general and administrative										(10)	(33)
Other charges										10	67
Income before income taxes										$ 0	$ 0
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassifications of Temporary to Permanent Equity									$ 107