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Share-Based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax benefit related to share-based compensation $ 9 $ 9 $ 25 $ 28
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      
Stock Options | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercisable period of plans (in years)     7 years  
Stock Options | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
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 $ 95   $ 95  
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 $ 17   $ 17  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years  
Target performance goal (as a percent) 139.00%      
Performance Share Units | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Description     0  
Performance Share Units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Description     2