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Acquisition of Ally Financial International Operations - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 02, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 03, 2015
Dec. 31, 2012
Business Acquisition [Line Items]            
Ownership percentage by noncontrolling owners (percent) 10.00%          
Goodwill $ 371 $ 1,189 $ 1,244 $ 1,240   $ 1,108
Equity income   116 0 0    
Pro forma net income     644      
Ally Financial International Operations [Member]            
Business Acquisition [Line Items]            
Aggregate consideration       3,300    
Liabilities incurred       $ 1,400    
SAIC-GMAC [Member]            
Business Acquisition [Line Items]            
Aggregate consideration 1,000          
Ownership percentage         35.00%  
Proceeds from sale of interest $ 125          
Equity income   $ 116 $ 107      
SAIC GMAC [Member]            
Business Acquisition [Line Items]            
Ownership percentage 40.00%          
Ownership percentage by noncontrolling owners (percent) 5.00%