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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Fair Value Measurements [Abstract]      
Carrying amount of total debt $ 981   $ 984
Fair value of total debt 1,029   $ 958
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