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Financial Instruments - Fair Value of Derivative Financial Instruments and Related Notional Amounts (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative [Line Items] |  |  |
Derivative asset |  | $ 1,140 | $ 822
Derivative liability |  | 1,024 | 691
Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative asset |  | 1,085 | 760
Derivative liability |  | 968 | 637
Foreign exchange contracts [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, notional amount | [1] | 22,984 | 18,723
Derivative asset | [1] | 654 | 179
Derivative liability | [1] | 586 | 459
Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, notional amount |  | 15,154 | 14,300
Derivative asset |  | 55 | 62
Derivative liability |  | 55 | 54
Interest rate contracts [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, notional amount |  | 11,145 | 12,430
Derivative asset |  | 432 | 581
Derivative liability |  | 383 | $ 178
Sales [Member] | Foreign exchange contracts [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, notional amount |  | $ 5,800 |
[1] | As of December 31, 2018, the notional amount of outstanding foreign currency forward-exchange contracts hedging our intercompany forecasted inventory sales was $5.8 billion.The following table provides information about the gains/(losses) incurred to hedge or offset operational foreign exchange or interest rate risk: Amount ofGains/(Losses)Recognized in OID(a), (b) Amount of Gains/(Losses)Recognized in OCI(a), (c) Amount of Gains/(Losses)Reclassified fromOCI into OID and COS(a), (c) As of December 31,(MILLIONS OF DOLLARS) 2018 2017 2018 2017 2018 2017Derivative Financial Instruments in Cash Flow Hedge Relationships: Foreign exchange contracts(d) $— $(6) $80 $(12) $(182) $520Amount excluded from effectiveness testing recognized in earnings based on an amortization approach — 140 153 Derivative Financial Instruments in Fair Value Hedge Relationships: Interest rate contracts (348) (60) — — — —Hedged item gain 348 60 — — — —Foreign exchange contracts 5 (19) — — — —Hedged item gain/(loss) (5) 19 — — — — Derivative Financial Instruments in Net Investment Hedge Relationships: Foreign exchange contracts — — 175 — — —The portion of gains/(losses) on foreign exchange contracts excluded from the assessment of hedge effectiveness — 77 68 Non-Derivative Financial Instruments in Net Investment Hedge Relationships: Foreign currency short-term borrowings — — 68 — — —Foreign currency long-term debt(e) — — 149 (580) — — Derivative Financial Instruments Not Designated as Hedges: Foreign exchange contracts 136 (87) — — — —All other net — — (1) 2 2 1 $136 $(93) $688 $(591) $41 $520

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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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