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Stock-Based Compensation (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
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 $ 76      
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 $ 44      
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 1      
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 $ 477      
Weighted-average service period 2 years 2 months      
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 0.3 1.9    
Repurchase and retirement of common stock $ 31 $ 129    
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 1.1 0.0    
Repurchase and retirement of common stock $ 119 $ 0    
Stock-based compensation expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred Income Tax Expense (Benefit) 10 $ 9    
Accounting Standards Update 2016-09 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cumulative Effect on Retained Earnings, Net of Tax $ 8