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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended 20 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 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 $ 8   $ 73 $ 16      
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%   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%   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 and restricted stock rights $ 31   $ 31   $ 31    
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   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%   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       $ 12.01      
Unrecognized compensation cost related to stock options and restricted stock rights $ 10   $ 10   $ 10    
Weighted-average service period     1 year 8 months        
Restricted Stock Rights [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unrecognized compensation cost related to stock options and restricted stock rights $ 277   $ 277   $ 277    
Weighted-average service period     1 year 5 months        
Weighted-average grant date fair values of restricted stock rights granted $ 70.57   $ 64.45        
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 0.0 2.5 1.0 6.5 9.2    
Repurchase and retirement of common stock $ 0 $ 97 $ 57 $ 242 $ 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 1.8 0.0 4.8 0.0      
Repurchase and retirement of common stock $ 126 $ 0 $ 327 $ 0      
Repurchase Program, Total [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock Repurchased and Retired During Period, Shares 1.8 2.5 5.8 6.5      
Repurchase and retirement of common stock $ 126 $ 97 $ 384 $ 242