Derivative and Financial Instruments (Foreign Currency Exchange - Balance Sheet Location and Fair Value Amounts of Derivatives) (Details) - USD ($) $ in Millions |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Prepaid Expenses and Other Current Assets [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Foreign currency exchange derivative assets | $ 28 | $ 2 |
| Other Accruals [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Foreign currency exchange derivative liabilities | $ 9 | $ 16 |