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Long-Term Incentive Compensation (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2019
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of options granted           0 0 0
2013 Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Maximum shares 88,700,000              
Period of service for immediate vesting upon death, disability or retirement 3 years              
Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period for stock awards from grant date 3 years              
Expiration period from date of grant 7 years              
Increase (decrease) in deferred tax asset           $ 1,000,000   $ 0
Equity-classified awards, unrecognized compensation cost           $ 0    
Number of options granted           0 0 0
Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period for stock awards from grant date 4 years              
Increase (decrease) in deferred tax asset           $ 1,000,000 $ 2,000,000 $ 1,000,000
Equity-classified awards, unrecognized compensation cost           $ 1,000,000    
Equity-classified awards, weighted average period over which unrecognized cost is recognized, years           1 year 7 months 6 days    
Total fair value of restricted stock grants           $ 2,000,000 2,000,000 2,000,000
Total fair value of shares vested           $ 5,000,000 $ 6,000,000 $ 11,000,000
Number of units awarded           438,000 584,000 493,000
Equity-Classified Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Equity-classified awards, unrecognized compensation cost           $ 1,000,000    
Equity-classified awards, weighted average period over which unrecognized cost is recognized, years           1 year 2 months 12 days    
Number of units awarded           0 186,000  
Performance units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period for stock awards from grant date 3 years         3 years 3 years 3 years
Increase (decrease) in deferred tax asset           $ 2,000,000 $ 1,000,000 $ 1,000,000
Number of units awarded           0 0 0
Performance units | Cliff Vesting                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period for stock awards from grant date 3 years              
Liability-Classified RSUs                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Increase (decrease) in deferred tax asset           $ 1,000,000 $ 1,000,000 $ 1,000,000
Liability-classified restricted stock, vesting period   4 years 4 years 4 years 4 years 3 years    
Liability-classified restricted stock, unrecognized compensation cost           $ 19,000,000    
Liability-classified restricted stock, weighted average period over which unrecognized cost is recognized, years           1 year 8 months 12 days    
Liability-Classified Performance Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Increase (decrease) in deferred tax asset           $ 4,000,000 $ 2,000,000 $ (1,000,000)
Liability-classified performance units, vesting period           3 years    
Liability-classified performance units, unrecognized compensation cost           $ 14,000,000    
Liability-classified performance units, weighted average period over which unrecognized cost is recognized, years           1 year 7 months 6 days    
Performance cash awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period for stock awards from grant date           4 years    
Increase (decrease) in deferred tax asset           $ 1,000,000    
Liability-classified restricted stock, unrecognized compensation cost           $ 21,000,000    
Liability-classified restricted stock, weighted average period over which unrecognized cost is recognized, years           2 years 8 months 12 days