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Fair Value Measurements (Financial Assets And Liabilities Carried At Fair Value) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets: |  |
Available-for-sale debt securities | $ 27 | $ 34
Investment in equity securities | 176 | 111
Cross-currency swap derivative contracts, assets |  | 26
Liabilities: |  |
Cross-currency swap derivative contracts, liabilities | 622 | 112
Deferred compensation plans | 111 | 70
Quoted Prices in Active Market (Level 1) |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Investment in equity securities | 6 | 0
Cross-currency swap derivative contracts, assets |  | 0
Liabilities: |  |
Cross-currency swap derivative contracts, liabilities | 0 | 0
Deferred compensation plans | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Available-for-sale debt securities | 27 | 34
Investment in equity securities | 0 | 0
Cross-currency swap derivative contracts, assets |  | 26
Liabilities: |  |
Cross-currency swap derivative contracts, liabilities | 622 | 112
Deferred compensation plans | 111 | 70
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Investment in equity securities | 0 | 0
Cross-currency swap derivative contracts, assets |  | 0
Liabilities: |  |
Cross-currency swap derivative contracts, liabilities | 0 | 0
Deferred compensation plans | $ 0 | $ 0

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