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Fair Value of Financial Instruments and Risk Management (Summary of Changes in Fair Value of Balance Sheet Hedges) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value Disclosures [Abstract]        
Balance Sheet Hedges - Fair Value $ (1) $ (1) $ (1) $ 0
Balance Sheet Position - Remeasurement 1 0 (5) 6
Net $ 0 $ (1) $ (6) $ 6