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Stock Plans 10 (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Mar. 29, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Capitalized share-based compensation costs $ 0 $ 0 $ 0  
Closing price of Company's common stock (in dollars per share)       $ 33.90
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 $ 98 $ 88 $ 78  
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) $ 32.15 $ 30.65 $ 27.47  
Number of shares available for future issuances under ESPP 28.8      
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