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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 14 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
May. 04, 2015
May. 05, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Excess Tax Benefit from Share-based Compensation, Financing Activities $ 40 $ 12      
Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage range of shares received at vesting based on total stockholder return ("TSR") 0.00%   0.00%    
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage range of shares received at vesting based on total stockholder return ("TSR") 200.00%   200.00%    
Market-Based Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to stock options $ 41   $ 41    
Weighted-average grant date fair values of restricted stock rights granted $ 79.81        
Maximum number of common shares to be earned during the performance period, Grants 0.8        
Maximum number of common shares to be earned during the performance period, outstanding 1.3   1.3    
Market-Based Restricted Stock Units [Member] | Target          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of target of presented shares granted that may potentially vest 100.00%   100.00%    
Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 12.00      
Unrecognized compensation cost related to stock options $ 14   $ 14    
Weighted-average service period 2 years        
Restricted Stock Rights [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to stock options $ 345   $ 345    
Weighted-average service period 1 year 10 months        
Weighted-average grant date fair values of restricted stock rights granted $ 62.64 $ 35.49      
May 2014 Repurchase Program [Member] [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Amount of common stock authorized for repurchase         $ 750
Stock Repurchased and Retired During Period, Shares 1.0 1.0 9.2    
Repurchase and retirement of common stock $ 57 $ 50 $ 394    
May 2015 Repurchase Program [Member] [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Amount of common stock authorized for repurchase       $ 1,000  
Stock Repurchased and Retired During Period, Shares 1.0 0.0      
Repurchase and retirement of common stock $ 75 $ 0      
Repurchase Program, Total [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock Repurchased and Retired During Period, Shares 2.0 1.0      
Repurchase and retirement of common stock $ 132 $ 50