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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended 32 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 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 $ 16 $ 8 $ 53 $ 73      
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 $ 40   $ 40   $ 40    
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] | 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%    
Market-Based Restricted Stock Units [Member] | 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] | 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 $ 4   $ 4   $ 4    
Weighted-average service period     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 $ 312   $ 312   $ 312    
Weighted-average service period     1 year 7 months        
Weighted-average grant date fair values of restricted stock rights granted $ 80.04   $ 75.68        
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 1.5 1.8 5.0 4.8      
Repurchase and retirement of common stock $ 127 $ 126 $ 383 $ 327      
Repurchase Program, Total [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock Repurchased and Retired During Period, Shares 1.5 1.8 5.0 5.8      
Repurchase and retirement of common stock $ 127 $ 126 $ 383 $ 384      
Stock-based compensation expense [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Deferred Income Tax Expense (Benefit) $ 10   $ 28