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Accounting for Share-Based Compensation 2 (Details) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Dec. 31, 2014
Unrecognized share-based compensation costs  
Unrecognized share-based compensation costs $ 120us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Weighted average period expected to be recognized (in years) 2 years 1 month 6 days
Stock Option Awards [Member]  
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 [Member]  
Unrecognized share-based compensation costs  
Unrecognized share-based compensation costs 19us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Weighted average period expected to be recognized (in years) 2 years 0 months 0 days
Restricted Stock Awards [Member]  
Unrecognized share-based compensation costs  
Unrecognized share-based compensation costs 69us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Weighted average period expected to be recognized (in years) 2 years 1 month 6 days
Performance Share Units [Member]  
Unrecognized share-based compensation costs  
Unrecognized share-based compensation costs $ 26us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Weighted average period expected to be recognized (in years) 2 years 7 months 6 days