XML 80 R65.htm IDEA: XBRL DOCUMENT v3.8.0.1
Stock-Based Compensation (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 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 $ 58     $ 58      
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%      
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%      
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 $ 39     $ 39      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       103.00%      
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%     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%     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 $ 556     $ 556      
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 $ 459     $ 459      
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 1.5 0.3 5.0    
Repurchase and retirement of common stock $ 0 $ 31 $ 127 $ 31 $ 383    
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 1.4     3.8      
Repurchase and retirement of common stock $ 150     $ 422      
Repurchase Program, Total [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock Repurchased and Retired During Period, Shares 1.4   1.5 4.1 5.0    
Repurchase and retirement of common stock $ 150   $ 127 $ 453 $ 383    
Stock-based compensation expense [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Deferred Income Tax Expense (Benefit) $ 4   $ 10 $ 26 $ 28    
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