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GM Financial Receivables, net Accretable Yield (Details) (GM Financial [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
GM Financial [Member]
   
Financial Receivables [Line Items]    
Balance at beginning of period $ 404 $ 737
Ally Financial international operations acquisition 127  
Accretion of accretable yield (342) (503)
Transfer from nonaccretable difference 74 170
Effect of foreign currency (8) 0
Balance at end of period $ 255 $ 404