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Share-Based Compensation (Narrative) (Details)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2024
USD ($)
yr
Dec. 31, 2023
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax benefit related to share-based compensation $ 4 $ 4 $ 7 $ 8
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 95   $ 95  
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]        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 55   $ 55  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     2 years  
Vesting Period in years for Shares | yr     3  
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%
Performance Share Units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target performance goal (as a percent)     240.00% 240.00%