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Share-Based Compensation (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax benefit related to share-based compensation $ 5 $ 4 $ 12 $ 13
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 1   $ 1  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     1 year  
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 93   $ 93  
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 $ 29   $ 29  
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%