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Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Statement of Financial Position [Abstract]    
Allowances for accounts receivable $ 3us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 4us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Common stock, par value (in usd per share) $ 0us-gaap_CommonStockNoParValue $ 0us-gaap_CommonStockNoParValue
Common stock, shares authorized unlimited unlimited
Common stock, shares issued 1,000us-gaap_CommonStockSharesIssued 1,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 1,000us-gaap_CommonStockSharesOutstanding 1,000us-gaap_CommonStockSharesOutstanding