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Other (Loss) Income, Net (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Component of Other Income (Loss), Net [Line Items]              
Other (loss) income, net $ (1) $ (15) $ 9 $ (32) $ (65) $ (45) $ (1)
Gain on Purchase of Business [Member]
              
Component of Other Income (Loss), Net [Line Items]              
Other (loss) income, net         0 16 0
Loss on extinguishment of debt [Member]
              
Component of Other Income (Loss), Net [Line Items]              
Other (loss) income, net 0 0 (2) 0 0 (39) (6)
Realized and unrealized loss on derivatives, net [Member]
              
Component of Other Income (Loss), Net [Line Items]              
Other (loss) income, net (3) 0 (3) 0      
Dividend expense related to securities sod, not yet purchased [Member]
              
Component of Other Income (Loss), Net [Line Items]              
Other (loss) income, net (1) (19) (3) (32) (86) (29) (62)
(Loss) gain on disposition of assets [Member]
              
Component of Other Income (Loss), Net [Line Items]              
Other (loss) income, net (2) 2 1 0 (4) 1 8
Appreciation on deferred management fee [Member]
              
Component of Other Income (Loss), Net [Line Items]              
Other (loss) income, net 0 0 0 (13)      
Equity earnings from non-consolidated affiliates [Member]
              
Component of Other Income (Loss), Net [Line Items]              
Other (loss) income, net 13 8 24 16 30 25 12
Foreign currency translation loss [Member]
              
Component of Other Income (Loss), Net [Line Items]              
Other (loss) income, net (5) (5) (7) (6) (9) (26) 3
Other [Member]
              
Component of Other Income (Loss), Net [Line Items]              
Other (loss) income, net $ (3) $ (1) $ (1) $ 3 $ 4 $ 7 $ 44