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Revenue - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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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 |

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- Definition Deferred Revenue, Due Thereafter + References No definition available. + Details
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- Definition Deferred Revenue, Due in Remainder of Fiscal Year + References No definition available. + Details
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- Definition Deferred Revenue, Due in Year Three + References No definition available. + Details
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- Definition Deferred Revenue, Due in Year Two + References No definition available. + Details
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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 + Details
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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 + Details
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