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Notes receivable, net (Details) (Automotive [Member], Receivables, less allowances and Other assets [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Automotive [Member] | Receivables, less allowances and Other assets [Member]
   
Financing Receivables [Line Items]    
Notes receivable $ 542 $ 384
Less: Allowance for credit losses (23) (29)
Notes receivable, net $ 519 $ 355