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Share-Based Compensation (Narrative) (Details)
shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2025
USD ($)
shares
Mar. 31, 2024
USD ($)
Mar. 31, 2025
USD ($)
yr
shares
Mar. 31, 2024
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax benefit related to share-based compensation $ 4 $ 4 $ 11 $ 12
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant | shares 15,000   15,000  
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 $ 79   $ 79  
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 $ 53   $ 53  
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%