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Consolidated Balance Sheets Consolidated Balance Sheets Parenthetical (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Allowance for Doubtful Accounts Receivable, Current $ 1us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 1us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred Stock, Par or Stated Value Per Share $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Stock, Shares Authorized 100,000,000us-gaap_PreferredStockSharesAuthorized 100,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Shares Issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred Stock, Shares Outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common Stock, Par or Stated Value Per Share $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common Stock, Shares Authorized 500,000,000us-gaap_CommonStockSharesAuthorized 500,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, Shares, Issued 116,000,000us-gaap_CommonStockSharesIssued 115,000,000us-gaap_CommonStockSharesIssued
Common Stock, Shares, Outstanding 113,000,000us-gaap_CommonStockSharesOutstanding 115,000,000us-gaap_CommonStockSharesOutstanding
Treasury Stock, Shares 3,000,000us-gaap_TreasuryStockShares 0us-gaap_TreasuryStockShares