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Contingencies and Litigation (Details) (Brazil Tax And Labor Contingencies [Member], USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Brazil Tax And Labor Contingencies [Member]
   
Loss Contingencies [Line Items]    
Unreserved tax and labor contingencies $ 884 $ 933
Escrow cash deposits 153  
Net book value of assets with liens 18  
Letters of credit $ 257