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Fair Value Measurements (Financial Assets And Liabilities Carried At Fair Value) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Available-for-sale debt securities | $ 20 | $ 27
Investment in equity securities | 336 | 176
Cross-currency swap derivative contracts | 50 | 0
Liabilities: |  |
Cross-currency swap derivative contracts | 0 | 622
Quoted Prices in Active Market (Level 1) |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Investment in equity securities | 88 | 6
Cross-currency swap derivative contracts | 0 | 0
Liabilities: |  |
Cross-currency swap derivative contracts | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Available-for-sale debt securities | 20 | 27
Investment in equity securities | 0 | 0
Cross-currency swap derivative contracts | 50 | 0
Liabilities: |  |
Cross-currency swap derivative contracts | 0 | 622
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Investment in equity securities | 0 | 0
Cross-currency swap derivative contracts | 0 | 0
Liabilities: |  |
Cross-currency swap derivative contracts | $ 0 | $ 0

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