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Stock-Based Compensation Expense (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 15, 2021
instrument
$ / shares
shares
Feb. 15, 2021
instrument
$ / shares
shares
Jun. 30, 2021
$ / shares
shares
Mar. 31, 2021
USD ($)
shares
Feb. 28, 2021
shares
Aug. 31, 2020
installment
$ / shares
shares
Mar. 31, 2020
installment
shares
Feb. 29, 2020
installment
shares
Oct. 31, 2018
$ / shares
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock-based compensation expense | $                   $ 5 $ 1 $ 14 $ 12  
Performance Shares Units (PSUs)                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares granted (in shares) 75,000 1,181,031           208,268            
Number of vesting installments 3 3           3            
Number of shares issued (in shares)       45,661                    
Grant date fair value (in dollars per share) | $ / shares $ 36.22 $ 36.22                        
Award requisite service period                       4 years    
Restricted Stock Units (RSUs)                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares issued (in shares)     9,390           5,953          
Restricted Stock Units (RSUs) | Executive Officer                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares granted (in shares)     17,500     5,000     8,000          
Number of vesting installments | installment           3                
Number of shares issued (in shares)         1,697                  
Grant date fair value (in dollars per share) | $ / shares     $ 53.59     $ 48.99     $ 47.59          
Phantom Shares                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Number of shares granted (in shares)             167,060              
Number of vesting installments | installment             3              
Cash used to settle award | $       $ 2                    
Share based compensation liability | $                   $ 2   $ 2   $ 2