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Share-Based Compensation (Narrative) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Tax benefit related to share-based compensation $ 2,000,000 $ 3,000,000 $ 6,000,000 $ 7,000,000    
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period (in years)     3 years      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount 200,000   $ 200,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     2 years      
Exercisable period of plans (in years)     10 years      
Restricted Share Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period (in years)     3 years      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount 103,000,000   $ 103,000,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     2 years      
Performance Share Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting Period in years for Shares     3      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 28,000,000   $ 28,000,000      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     2 years      
Performance Share Units | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Target performance goal (as a percent)     0.00%   0.00% 0.00%
Performance Share Units | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Target performance goal (as a percent)     234.00%   240.00% 240.00%