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Stock Plans 2 (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Unrecognized share-based compensation costs  
Unrecognized share-based compensation costs $ 100us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Weighted average period expected to be recognized (in years) 2 years 0 months 0 days
Stock Option Awards  
Unrecognized share-based compensation costs  
Unrecognized share-based compensation costs 6us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Weighted average period expected to be recognized (in years) 1 year 9 months 18 days
Restricted Stock Units  
Unrecognized share-based compensation costs  
Unrecognized share-based compensation costs 16us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Weighted average period expected to be recognized (in years) 1 year 10 months 24 days
Restricted Stock Awards  
Unrecognized share-based compensation costs  
Unrecognized share-based compensation costs 55us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Weighted average period expected to be recognized (in years) 1 year 10 months 24 days
Performance Share Units  
Unrecognized share-based compensation costs  
Unrecognized share-based compensation costs $ 23us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Weighted average period expected to be recognized (in years) 2 years 3 months 18 days