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Equity (Details 2) (Details) (USD $)
3 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Stockholders' Equity Attributable to Redeemable Noncontrolling Interest [Roll Forward]      
Redeemable Noncontrolling Interest, Equity, Carrying Amount $ 792,000,000 $ 0 $ 0
Net Income (Loss) Attributable to Noncontrolling Interest 18,000,000    
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders (15,000,000)    
Noncontrolling Interest, Change in Redemption Value 15,000,000    
Redeemable Noncontrolling Interest, Equity, Carrying Amount $ 810,000,000 $ 0 $ 0