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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax benefit related to share-based compensation $ 8 $ 9 $ 20 $ 25
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (in years) 3 years      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 26   26  
Employee Service Share-based Compensation, Nonvested Awards, Compensation 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      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 73   73  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years      
Performance Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (in years) 3 years      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 9   $ 9  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years      
Target performance goal (as a percent) 133.00%      
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) 200.00%