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Fair Value Measurements (Assets and Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs (Level 3)) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Due in one year or less $ 40 $ 50
Due after one year through three years 38 38
Fair Value, Inputs, Level 2 | Interest Rate Swap    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency exchange forward contracts 65 0
Fair Value, Inputs, Level 2 | Foreign Exchange Contract    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency exchange forward contracts $ 105 $ 23