Annual report pursuant to Section 13 and 15(d)

VIEs - Narrative (Details)

v3.3.1.900
VIEs - Narrative (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Mar. 31, 2015
securitization
Dec. 31, 2012
USD ($)
Mar. 31, 2012
USD ($)
Sep. 30, 2011
USD ($)
Dec. 31, 2015
securitization
Dec. 31, 2013
USD ($)
Dec. 31, 2010
USD ($)
Variable Interest Entity [Line Items]                
Total of automobile loans transferred In securitization transaction $ 800   $ 1,000 $ 1,300 $ 1,000      
Maximum year to defer payment of interest on Debenture           5 years    
Tower Hill Securities, Inc.                
Variable Interest Entity [Line Items]                
Transfers of financial assets accounted for as secured financing, municipal securities               $ 92
Transfers of financial assets accounted for as secured financing, preferred stock               86
Transfers of financial assets accounted for as secured financing, cash               6
Received financial assets accounted for as secured financing, common and preferred stock               $ 184
Low Income Housing Tax Credit Partnerships                
Variable Interest Entity [Line Items]                
Gain on sale of investments             $ 9  
Macquarie Equipment Finance                
Variable Interest Entity [Line Items]                
Number of securitizations | securitization   2       2