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Financial Instruments - Notional Values of Hedging Instruments (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Euro notes | Net investment hedge debt |  |
Derivative [Line Items] |  |
Notional Amount | $ 3,688 | $ 3,744
British pound sterling notes | Net investment hedge debt |  |
Derivative [Line Items] |  |
Notional Amount | 355 | 360
Swiss franc notes | Net investment hedge debt |  |
Derivative [Line Items] |  |
Notional Amount | 1,116 | 1,175
Canadian dollar notes | Net investment hedge debt |  |
Derivative [Line Items] |  |
Notional Amount | 473 | 472
Currency exchange contracts | Intercompany loans and forecasted interest payments |  |
Derivative [Line Items] |  |
Notional Amount | 1,185 | 2,184
Currency exchange contracts | Forecasted transactions |  |
Derivative [Line Items] |  |
Notional Amount | 4,022 | 4,169
Commodity contracts |  |
Derivative [Line Items] |  |
Notional Amount | 8,573 | 7,947
Interest rate contracts |  |
Derivative [Line Items] |  |
Notional Amount | 1,850 | 3,500
Net investment hedge contracts |  |
Derivative [Line Items] |  |
Notional Amount | 3,914 | $ 4,551
Net investment hedge contracts | Net investment hedge debt |  |
Derivative [Line Items] |  |
Notional Amount | $ 3,900 |

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