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Fair Value Measurements (Narrative) (Details) - USD ($)
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value Measurements [Abstract]      
Allowances for credit losses $ 0 $ 0  
Carrying amount of total debt 976,000,000   $ 980,000,000
Fair value of total debt 1,005,000,000   $ 1,031,000,000
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount 0 0  
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 0 0  
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount 0 0  
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net 0 0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net $ 0 $ 0