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Fair Value (Quantitative Information) (Details) - USD ($) $ in Millions | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | $ (112) | $ (70) | $ (90) | $ (232) | $ (199) | $ (102)
Interest Rate Contract [Member] |  |  |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | (192) | (166) | (236) | (286) | (269) | (184)
Foreign Exchange Contract [Member] |  |  |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | 97 | 98 | 146 | 76 | 99 | 94
Cross currency derivatives [Member] |  |  |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | (32) | (3) | (2) | (23) | (29) | (11)
Commodity Contract [Member] |  |  |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | $ 15 | $ 1 | $ 2 | $ 1 | $ 0 | $ (1)
Measurement Input, Entity Credit Risk [Member] | Interest Rate Contract [Member] | Minimum [Member] |  |  |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring | 0.60% |  |  |  |  |
Measurement Input, Entity Credit Risk [Member] | Interest Rate Contract [Member] | Maximum [Member] |  |  |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring | 3.40% |  |  |  |  |
Measurement Input, Entity Credit Risk [Member] | Interest Rate Contract [Member] | Weighted Average [Member] |  |  |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring | 3.40% |  |  |  |  |
Measurement Input, Entity Credit Risk [Member] | Cross currency derivatives [Member] | Minimum [Member] |  |  |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring | 3.60% |  |  |  |  |
Measurement Input, Entity Credit Risk [Member] | Cross currency derivatives [Member] | Maximum [Member] |  |  |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring | 3.60% |  |  |  |  |
Measurement Input, Entity Credit Risk [Member] | Cross currency derivatives [Member] | Weighted Average [Member] |  |  |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |  |  |
Fair Value Measurement Inputs, Nonrecurring | 3.60% |  |  |  |  |

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