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Financial Instruments - Fair Value of Derivative Financial Instruments and Related Notional Amounts (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Derivative [Line Items] |  |  |
Asset |  | $ 1,043 | $ 822
Liability |  | 1,174 | 691
Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Asset |  | 925 | 760
Liability |  | 1,126 | 637
Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Notional | [1] | 19,955 | 18,723
Asset | [1] | 590 | 179
Liability | [1] | 464 | 459
Designated as Hedging Instrument [Member] | Interest rate contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Notional |  | 11,300 | 12,430
Asset |  | 335 | 581
Liability |  | 661 | 178
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Notional |  | 16,798 | 14,300
Asset |  | 118 | 62
Liability |  | 48 | $ 54
Inventory sales [Member] | Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Notional | [1] | $ 5,400 |
[1] | As of September 30, 2018, the notional amount of outstanding foreign currency forward-exchange contracts hedging our intercompany forecasted inventory sales was $5.4 billion.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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