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Contingencies, Contingencies (Details) (Brazil Tax And Labor Contingencies [Member], USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Brazil Tax And Labor Contingencies [Member]
   
Loss Contingencies [Line Items]    
Unreserved tax and labor contingencies $ 1,047 $ 1,120
Escrow cash deposits 211  
Net book value of assets with liens 14  
Letters of credit $ 225