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Financial Instruments - Fair Value of Derivatives Segregated Between Those Derivatives That are Designated as Hedging Instruments and Those That are Not Designated as Hedging Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Feb. 29, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Fair Value of Derivative, Asset | $ 182 |  | $ 288
Fair Value of Derivative, Liability | 525 |  | 97
U.S. Dollar Notional | 32,784 |  | 30,666
Derivatives Designated as Hedging Instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value of Derivative, Asset | 112 |  | 222
Fair Value of Derivative, Liability | 218 |  | 24
U.S. Dollar Notional | 13,714 |  | 14,728
Derivatives Not Designated as Hedging Instruments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value of Derivative, Asset | 70 |  | 66
Fair Value of Derivative, Liability | 307 |  | 73
U.S. Dollar Notional | 19,070 |  | 15,938
Interest rate swap contracts | Derivatives Designated as Hedging Instruments | Other Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value of Derivative, Asset | 54 |  | 15
U.S. Dollar Notional | 2,250 |  | 3,400
Interest rate swap contracts | Derivatives Designated as Hedging Instruments | Other current assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value of Derivative, Asset | 1 |  | 0
U.S. Dollar Notional | 1,150 |  | 0
Interest rate swap contracts | Derivatives Designated as Hedging Instruments | Accrued and other current liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value of Derivative, Liability | 0 |  | 1
U.S. Dollar Notional | 0 |  | 1,250
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Other Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value of Derivative, Asset | 45 |  | 55
U.S. Dollar Notional | 2,030 |  | 2,160
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Other current assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value of Derivative, Asset | 12 |  | 152
U.S. Dollar Notional | 3,183 |  | 6,117
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Accrued and other current liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value of Derivative, Liability | 217 |  | 22
U.S. Dollar Notional | 5,049 |  | 1,748
Foreign exchange contracts | Derivatives Designated as Hedging Instruments | Other Noncurrent Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value of Derivative, Liability | 1 |  | 1
U.S. Dollar Notional | 52 |  | 53
Foreign exchange contracts | Derivatives Not Designated as Hedging Instruments | Other current assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value of Derivative, Asset | 70 |  | 66
U.S. Dollar Notional | 7,260 |  | 7,245
Foreign exchange contracts | Derivatives Not Designated as Hedging Instruments | Accrued and other current liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Value of Derivative, Liability | 307 |  | 73
U.S. Dollar Notional | $ 11,810 |  | $ 8,693
Interest Rate Swap |  |  |
Derivatives, Fair Value [Line Items] |  |  |
U.S. Dollar Notional |  | $ 250 |

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