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Financial Instruments Fair Value of Derivatives (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative Asset, Gross |  | $ 90 | $ 55 | $ 266
Derivative Asset, Counterparty and Cash Collateral Netting | [1] | (32) | (40) | (110)
Derivative Asset, Net |  | 58 | 15 | 156
Derivative Liability, Gross |  | 62 | 135 | 108
Derivative Liability, Counterparty and Cash Collateral Netting | [1] | (30) | (40) | (103)
Derivative Liability, Net |  | 32 | 95 | 5
Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] | Other Current Assets [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative Asset, Gross |  | 38 | 15 | 36
Derivative Asset, Counterparty and Cash Collateral Netting | [1] | 0 | 0 | 0
Derivative Asset, Net |  | 38 | 15 | 36
Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] | Accrued and Other Current Liabilities [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative Liability, Gross |  | 16 | 38 |
Derivative Liability, Counterparty and Cash Collateral Netting | [1] | 0 | 0 |
Derivative Liability, Net |  | 16 | 38 |
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] | Other Current Assets [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative Asset, Gross |  | 52 | 40 | 230
Derivative Asset, Counterparty and Cash Collateral Netting | [1] | (32) | (40) | (110)
Derivative Asset, Net |  | 20 | 0 | 120
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member] | Accrued and Other Current Liabilities [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative Liability, Gross |  | 46 | 97 | 108
Derivative Liability, Counterparty and Cash Collateral Netting | [1] | (30) | (40) | (103)
Derivative Liability, Net |  | $ 16 | $ 57 | $ 5
[1] | Counterparty and cash collateral amounts represent the estimated net settlement amount when applying netting and set-off rights included in master netting arrangements between the company and its counterparties and the payable or receivable for cash collateral held or placed with the same counterparty.

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