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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
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value Disclosures [Abstract]    
Balance Sheet Hedges - Fair Value $ 0 $ (5)
Balance Sheet Position - Remeasurement (8) 9
Net $ (8) $ 4