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Share-Based Compensation (Summary of Unrecognized Compensation Cost And Weighted Average Period For Recognition) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Unrecognized Compensation And Weighted Average Recognition [Line Items]  
Unrecognized compensation cost $ 82
Weighted average period for recognition (years) 2 years 4 months 24 days
Performance Share Units [Member]  
Unrecognized Compensation And Weighted Average Recognition [Line Items]  
Unrecognized compensation cost $ 13
Weighted average period for recognition (years) 1 year 8 months 12 days