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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Feb. 24, 2015
Feb. 28, 2019
Mar. 31, 2022
Mar. 31, 2021
Nov. 03, 2015
Apr. 27, 2015
Stock-Based Compensation [Line Items]            
Stock-based compensation expense     $ 6 $ 6    
Stock-based compensation expense, net of tax     4 $ 4    
Total unrecognized compensation costs related to non-vested stock options and restricted share units     $ 41      
Weighted-average period of recognition of stock-based compensation cost     2 years 1 month 24 days      
Percent of current fair market value, discount eligible employees may purchase common stock   10.00%        
Employee Stock Purchase Plan, maximum number of shares of common stock authorized for sale         1,000,000  
Employee stock plan, shares remaining in ESPP   843,584        
Expiration date for ESPP     Apr. 27, 2025      
Maximum [Member]            
Stock-Based Compensation [Line Items]            
Percent of current fair market value, discount eligible employees may purchase common stock 10.00%          
Employee Stock Purchase Plan, maximum number of shares of common stock authorized for sale           1,000,000
Employee Stock Purchase Plan [Member]            
Stock-Based Compensation [Line Items]            
Number of shares of available for issuance     741,120