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Share-Based Compensation (Narrative) (Details)
3 Months Ended 9 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax benefit related to share-based compensation $ 5,000,000 $ 5,000,000 $ 12,000,000 $ 12,000,000
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 90,000,000   $ 90,000,000  
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 $ 41,000,000   $ 41,000,000  
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%  
Performance Share Units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target performance goal (as a percent)     240.00%