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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 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Asset | $ 130 | $ 995
Fair Value of Derivative, Liability | 217 | 134
U.S. Dollar Notional | 25,595 | 25,539
Derivatives Designated as Hedging Instruments |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Asset | 91 | 765
Fair Value of Derivative, Liability | 127 | 31
U.S. Dollar Notional | 14,386 | 14,398
Derivatives Not Designated as Hedging Instruments |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Asset | 39 | 230
Fair Value of Derivative, Liability | 90 | 103
U.S. Dollar Notional | 11,209 | 11,141
Interest rate swap contracts | Derivatives Designated as Hedging Instruments | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Asset | 2 | 20
U.S. Dollar Notional | 550 | 2,700
Interest rate swap contracts | Derivatives Designated as Hedging Instruments | Accrued and other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Liability | 3 | 0
U.S. Dollar Notional | 1,000 | 0
Interest rate swap contracts | Derivatives Designated as Hedging Instruments | Other noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Liability | 52 | 29
U.S. Dollar Notional | 4,650 | 3,500
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Asset | 38 | 129
Fair Value of Derivative, Liability |  |
U.S. Dollar Notional | 1,936 | 2,075
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Asset | 51 | 616
U.S. Dollar Notional | 4,216 | 6,063
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Accrued and other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Liability | 71 | 1
U.S. Dollar Notional | 2,014 | 48
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 | 20 | 12
Foreign exchange contracts | Derivatives Not Designated as Hedging Instruments | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Asset | 39 | 230
U.S. Dollar Notional | 3,778 | 8,210
Foreign exchange contracts | Derivatives Not Designated as Hedging Instruments | Accrued and other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value of Derivative, Liability | 90 | 103
U.S. Dollar Notional | $ 7,431 | $ 2,931

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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://www.xbrl.org/2003/role/presentationRef -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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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