Accounting Policies - Components on Consolidated Statements of Income Impacted (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of sales	$ (5,803)	$ (5,075)	$ (4,514)
Gross profit	3,861	3,272	2,459
Selling, general and administrative	(1,095)	(981)	(907)
Research and development	(1,398)	(1,296)	(1,331)
Operating income	1,400	1,005	227
Other components of pension benefit costs	$ (11)	(12)	(13)
Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of sales		(5,079)	(4,518)
Gross profit		3,268	2,455
Selling, general and administrative		(983)	(911)
Research and development		(1,302)	(1,336)
Operating income		$ 993	$ 214

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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