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Stock Plans 10 (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Tax benefit from share-based incentive awards deductible for tax purposes $ 1 $ 1 $ 1
Capitalized share-based compensation costs $ 0 0 0
Closing price of Company's common stock (in dollars per share) $ 31.72    
Computation of expected life, Simplified method The Company’s computation of expected life was determined based on the simplified method (the average of the vesting period and option term).    
Total fair value on the vesting date of RSAs and RSUs released $ 88 $ 78 $ 75
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of stock closing price on last day of offer period that ESPP participants can purchase Company stock 95.00%    
Number of shares issued under ESPP 0.2 0.2 0.2
Average price per share issued under ESPP (in dollars per share) $ 30.65 $ 27.47 $ 28.06
Number of shares available for future issuances under ESPP 29.0    
Stock Option Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option awards vesting per year one-third    
Award vesting period from grant date (in years) 3 years    
Restricted Stock Awards (RSAs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period from grant date (in years) 3 years    
Restricted Stock Awards (RSAs) | 1-year PSUs under Incentive Plans | Grant Date      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage 34.00%    
Restricted Stock Awards (RSAs) | 1-year PSUs under Incentive Plans | First Anniversary      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage 33.00%    
Restricted Stock Awards (RSAs) | 1-year PSUs under Incentive Plans | Second Anniversary      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage 33.00%    
Restricted Stock Awards (RSAs) | 1-year PSUs under Sales Retention Equity Programs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period from grant date (in years) 3 years    
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period from grant date (in years) 3 years    
Restricted Stock Units (RSUs) | 1-year PSUs under Incentive Plans | Grant Date      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage 34.00%    
Restricted Stock Units (RSUs) | 1-year PSUs under Incentive Plans | First Anniversary      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage 33.00%    
Restricted Stock Units (RSUs) | 1-year PSUs under Incentive Plans | Second Anniversary      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting percentage 33.00%    
Restricted Stock Units (RSUs) | 1-year PSUs under Sales Retention Equity Programs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period from grant date (in years) 3 years    
Maximum | Stock Option Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration term from grant date (in years) 10 years    
2011 Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grant 45.0    
2011 Incentive Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration term from grant date (in years) 10 years    
2011 Incentive Plan | Maximum | Stock Option Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares available for grant 10.0