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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended 29 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
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 $ 4 $ 25 $ 37 $ 65      
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 $ 49   $ 49   $ 49    
Weighted-average grant date fair values of restricted stock rights granted     $ 98.04        
Maximum number of common shares to be earned during the performance period, Grants     0.7        
Maximum number of common shares to be earned during the performance period, outstanding     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]              
Unrecognized compensation cost related to stock options and restricted stock rights $ 5   $ 5   $ 5    
Weighted-average service period     1 year        
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 $ 352   $ 352   $ 352    
Weighted-average service period     1 year 9 months        
Weighted-average grant date fair values of restricted stock rights granted $ 79.16   $ 75.31        
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 0.0 0.0 1.0 9.2    
Repurchase and retirement of common stock $ 0 $ 0 $ 0 $ 57 $ 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 1.6 1.8 3.5 3.0      
Repurchase and retirement of common stock $ 127 $ 126 $ 256 $ 201      
Repurchase Program, Total [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock Repurchased and Retired During Period, Shares 1.6 1.8 3.5 4.0      
Repurchase and retirement of common stock $ 127 $ 126 $ 256 $ 258      
Stock-based compensation expense [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Deferred Income Tax Expense (Benefit) $ 9   $ 18