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Derivatives - Statement of Income Location and Impact of Cash Flow (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Cost of sales |  |
Derivatives in Fair Value Hedging Relationships |  |
Total amounts of income and expense line items presented in the consolidated statement of income in which the effects of cash flow or fair value hedges are recorded | $ 4,310 |
Other expense (income), net |  |
Derivatives in Fair Value Hedging Relationships |  |
Total amounts of income and expense line items presented in the consolidated statement of income in which the effects of cash flow or fair value hedges are recorded | 48 |
Cash flow hedge |  |
Gain or (loss) on cash flow hedging relationships: |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income | 7 |
Cash flow hedge | Foreign currency forward/option contracts | Cost of sales |  |
Gain or (loss) on cash flow hedging relationships: |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income into income | 7 |
Fair value hedges |  |
Gain or (loss) on fair value hedging relationships: |  |
Hedged items |  | $ (11)
Fair value hedges | Interest rate swap contracts | Other expense (income), net |  |
Gain or (loss) on fair value hedging relationships: |  |
Hedged items | (5) |
Fair value hedges | Derivatives designated as hedging instruments | Interest rate swap contracts | Other expense (income), net |  |
Gain or (loss) on fair value hedging relationships: |  |
Derivatives designated as hedging instruments | $ 5 |

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