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Long-Term Incentive Compensation (Schedule of Performance Cash Awards Stock-Based Compensation Costs) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-classified awards - expensed $ 30 $ 17 $ 17
Equity-classified awards - capitalized 18 7 $ 10
Performance cash awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-classified awards - expensed 4 2  
Equity-classified awards - capitalized $ 4 $ 2