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Financial Instruments - Notional Values of Hedging Instruments (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Net investment hedge debt | Euro notes |  |
Derivative [Line Items] |  |
Notional Amount | $ 3,381 | $ 3,436
Net investment hedge debt | British pound sterling notes |  |
Derivative [Line Items] |  |
Notional Amount | 327 | 349
Net investment hedge debt | Swiss franc notes |  |
Derivative [Line Items] |  |
Notional Amount | 1,223 | 1,448
Net investment hedge debt | Canadian dollar notes |  |
Derivative [Line Items] |  |
Notional Amount | 427 | 462
Currency exchange contracts | Intercompany loans and forecasted interest payments |  |
Derivative [Line Items] |  |
Notional Amount | 2,544 | 2,474
Currency exchange contracts | Forecasted transactions |  |
Derivative [Line Items] |  |
Notional Amount | 3,869 | 3,993
Commodity contracts |  |
Derivative [Line Items] |  |
Notional Amount | 7,571 | 7,238
Interest rate contracts |  |
Derivative [Line Items] |  |
Notional Amount | 4,250 | 5,250
Net investment hedge contracts |  |
Derivative [Line Items] |  |
Notional Amount | 6,652 | $ 6,864
Net investment hedge contracts | Net investment hedge debt |  |
Derivative [Line Items] |  |
Notional Amount | $ 6,700 |

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