|
Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified |
Dec. 31, 2014
|
Dec. 31, 2013
|
|---|---|---|
| Long-term Debt, Fair Value | $ 990us-gaap_LongTermDebtFairValue | $ 1,002us-gaap_LongTermDebtFairValue |
| Preferred Stock, Par or Stated Value Per Share | $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare | $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare |
| Preferred stock, shares authorized | 50,000,000us-gaap_PreferredStockSharesAuthorized | 50,000,000us-gaap_PreferredStockSharesAuthorized |
| Preferred stock, shares issued | 0us-gaap_PreferredStockSharesIssued | 0us-gaap_PreferredStockSharesIssued |
| Common Class A | Ìý | Ìý |
| Common stock, par or stated value per share |
$ 0.01us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
$ 0.01us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
| Common stock, shares authorized |