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Revenue - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue from Contract with Customer [Abstract]
Net sales and revenue	$ 36,099	$ 37,266
Deferred revenue revenue recognized	383
Deferred revenue expected to be recognized in remaining nine months of 2018	1,100
Deferred revenue expected to be recognized in 2019	780
Deferred revenue expected to be recognized in 2020	404
Deferred revenue expected to be recognized thereafter	$ 476

X

- Definition

Deferred Revenue, Due Thereafter

+ References

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- Definition

Deferred Revenue, Due in Remainder of Fiscal Year

+ References

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- Definition

Deferred Revenue, Due in Year Three

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- Definition

Deferred Revenue, Due in Year Two

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- Definition

Amount of revenue recognized that was previously reported as deferred or unearned revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response))
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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