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Equity (Details) (USD $)
In Millions, except Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Mar. 31, 2011
Common Stock, Shares, Outstanding beginning of period     75,316,419    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     $ 1,599    
Net Income (Loss) Attributable to Parent 22 24 91 51  
Common Stock, Shares, Outstanding end of period 75,341,104   75,341,104    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 1,648   1,648    
Common Stock, Capital Shares Reserved for Future Issuance         2,500,000
Common Stock [Member]
          
Common Stock, Shares, Outstanding beginning of period     75,316,419 75,210,580  
Vesting of Restricted and Performance Stock Units, Shares     12,104 69,561  
Stock Issued During Period, Shares, Employee Stock Purchase Plans     11,320 14,846  
Shares Issued During Period, Dividend Reinvestment and Direct Stock Purchase Plan     1,261    
Common Stock, Shares, Outstanding end of period 75,341,104 75,294,987 75,341,104 75,294,987  
Common Stock Including Additional Paid in Capital [Member]
          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     831 829  
Vesting of Restricted and Performance Stock Units, Value     0 0  
Stock Issued During Period, Value, Employee Stock Purchase Plan     0 0  
Stock Issued During Peirod, Value, Dividend Reinvestment and Direct Stock Purchase Plan     0    
Share-based Compensation     1 1  
Dividends, Common Stock     0 0  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders     0    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 832 830 832 830  
Accumulated Other Comprehensive Income (Loss) [Member]
          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     (5) (6)  
Vesting of Restricted and Performance Stock Units, Value     0 0  
Stock Issued During Period, Value, Employee Stock Purchase Plan     0 0  
Share-based Compensation     0 0  
Dividends, Common Stock     0 0  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders     0    
Other Comprehensive Income (Loss), Net of Tax       1  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (5) (5) (5) (5)  
Retained Earnings [Member]
          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     766 719  
Vesting of Restricted and Performance Stock Units, Value     0 0  
Stock Issued During Period, Value, Employee Stock Purchase Plan     0 0  
Share-based Compensation     0 0  
Dividends, Common Stock     (39) (39)  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders     0    
Net Income (Loss) Attributable to Parent     91 51  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 818 731 818 731  
Noncontrolling Interest [Member]
          
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest     7 1  
Vesting of Restricted and Performance Stock Units, Value     0 0  
Stock Issued During Period, Value, Employee Stock Purchase Plan     0 0  
Share-based Compensation     0 0  
Dividends, Common Stock     0 0  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders     (4)    
Net Income (Loss) Attributable to Noncontrolling Interest     0 0  
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 3 $ 1 $ 3 $ 1