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Financial Instruments - Fair Value of Derivatives Segregated between those Derivatives that are Designated as Hedging Instruments and those that are Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Asset | $ 387 | $ 130
Fair Value of Derivative, Liability | 204 | 217
U.S. Dollar Notional | 26,549 | 25,595
Derivatives Designated as Hedging Instruments |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Asset | 260 | 91
Fair Value of Derivative, Liability | 146 | 127
U.S. Dollar Notional | 14,720 | 14,386
Derivatives Not Designated as Hedging Instruments |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Asset | 127 | 39
Fair Value of Derivative, Liability | 58 | 90
U.S. Dollar Notional | 11,829 | 11,209
Interest rate swap contracts | Derivatives Designated as Hedging Instruments | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Asset | 0 | 2
U.S. Dollar Notional | 0 | 550
Interest rate swap contracts | Derivatives Designated as Hedging Instruments | Accrued and other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Liability | 2 | 3
U.S. Dollar Notional | 550 | 1,000
Interest rate swap contracts | Derivatives Designated as Hedging Instruments | Other noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Liability | 138 | 52
U.S. Dollar Notional | 4,650 | 4,650
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Asset | 85 | 38
U.S. Dollar Notional | 2,682 | 1,936
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Asset | 175 | 51
U.S. Dollar Notional | 6,115 | 4,216
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Accrued and other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Liability | 5 | 71
U.S. Dollar Notional | 657 | 2,014
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Other noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Liability | 1 | 1
U.S. Dollar Notional | 66 | 20
Foreign exchange contracts | Derivatives Not Designated as Hedging Instruments | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Asset | 127 | 39
U.S. Dollar Notional | 6,531 | 3,778
Foreign exchange contracts | Derivatives Not Designated as Hedging Instruments | Accrued and other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Liability | 58 | 90
U.S. Dollar Notional | $ 5,298 | $ 7,431

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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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