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Stock-Based Compensation Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future grants (shares) 15,950,013    
Options granted (in shares) 0 0  
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Shares granted (in shares) 2,068,825 5,280,429 2,100,126
Unrecognized compensation cost $ 4    
Weighted average recognition period 1 year 2 months 12 days    
Intrinsic value of units outstanding $ 24    
Fair value of units vested $ 12 $ 11 $ 22
Granted (in dollars per shares) $ 4.19 $ 4.82 $ 8.36
Restricted Stock Units | Directors' Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Shares granted (in shares) 222,833 158,416  
Restricted Stock Units With Performance Targets      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted (in shares) 1,513,928    
Performance Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
Options exercised (in shares)     777,429
Exercised (in dollars per share)     $ 6.11
Stock Options | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee stock purchase plan discounted offering price of commons stock 95.00%    
Shares purchased under the employee stock purchase plan (in shares) 371,982 381,229  
Shares reserved for future purchase under the employee stock purchase plan (in shares) 1,065,516