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Stock-Based Compensation (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
May 11, 2018
May 08, 2017
May 04, 2015
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 $ 94        
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%        
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%        
Performance 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 $ 34        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 104.00%        
Performance 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%        
Performance 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%        
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 $ 677        
Weighted-average service period 2 years 3 months        
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to stock options and restricted stock rights $ 549        
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 0.0 0.3      
Repurchase and retirement of common stock $ 0 $ 31      
May 2015 Repurchase Program [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock Repurchased and Retired During Period, Shares   0.3      
Repurchase and retirement of common stock   $ 31      
May 2017 Repurchase Program [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Amount of common stock authorized for repurchase       $ 1,200  
Stock Repurchased and Retired During Period, Shares 0.6 1.1      
Repurchase and retirement of common stock $ 76 $ 119      
May 2018 Repurchase Program [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Amount of common stock authorized for repurchase     $ 2,400    
Stock Repurchased and Retired During Period, Shares 1.7        
Repurchase and retirement of common stock $ 224        
Repurchase Program, Total [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock Repurchased and Retired During Period, Shares 2.3 1.4      
Repurchase and retirement of common stock $ 300 $ 150      
Stock-based compensation expense [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Deferred Income Tax Expense (Benefit) $ 8 $ 10