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Fair Value (Quantitative Information) (Details) - USD ($) $ in Millions | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs |  | $ (90) | $ (102) | $ 63
Foreign Exchange Contract [Member] |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs |  | 146 | 94 | 199
Interest Rate Contract |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs |  | (236) | (184) | (140)
Cross Currency Interest Rate Contract [Member] |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs |  | (2) | (11) | 0
Commodity Contract [Member] |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs |  | $ 2 | $ (1) | $ 4
Measurement Input, Entity Credit Risk [Member] | Interest Rate Contract | Minimum |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |
Fair Value Measurement Inputs, Nonrecurring | 0.60% |  |  |
Measurement Input, Entity Credit Risk [Member] | Interest Rate Contract | Maximum |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |
Fair Value Measurement Inputs, Nonrecurring | 3.60% |  |  |
Measurement Input, Entity Credit Risk [Member] | Interest Rate Contract | Weighted Average |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |
Fair Value Measurement Inputs, Nonrecurring | 3.50% |  |  |
Measurement Input, Entity Credit Risk [Member] | Cross Currency Interest Rate Contract [Member] | Minimum |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |
Fair Value Measurement Inputs, Nonrecurring | 3.60% |  |  |
Measurement Input, Entity Credit Risk [Member] | Cross Currency Interest Rate Contract [Member] | Maximum |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |
Fair Value Measurement Inputs, Nonrecurring | 3.60% |  |  |
Measurement Input, Entity Credit Risk [Member] | Cross Currency Interest Rate Contract [Member] | Weighted Average |  |  |  |
Fair Value Inputs Quantitative Information [Line Items] |  |  |  |
Fair Value Measurement Inputs, Nonrecurring | 3.60% |  |  |

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- Definition Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
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