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Fair Value Measurements and Financial Instruments - Schedule of Gain (Loss) Included in OCI (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Cash flow hedges [Abstract] |  |
Gain (loss) recognized in OCI | $ 53 | $ 25
Foreign Currency Contracts |  |
Cash flow hedges [Abstract] |  |
Gain (loss) recognized in OCI | 6 | 25
Net investment hedges [Abstract] |  |
Gain (loss) on instruments | 23 | 25
Gain (loss) on hedged items | (23) | (25)
Forward-starting interest rate swaps |  |
Cash flow hedges [Abstract] |  |
Gain (loss) recognized in OCI | 46 | 0
Commodity Contracts |  |
Cash flow hedges [Abstract] |  |
Gain (loss) recognized in OCI | 1 | 0
Foreign Currency Debt |  |
Net investment hedges [Abstract] |  |
Gain (loss) on instruments | 211 | 65
Gain (loss) on hedged items | $ (211) | $ (65)

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