XML 67 R48.htm IDEA: XBRL DOCUMENT v3.7.0.1
Consolidations and Transfers of Financial Assets Transfers of Financial Assets (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Transfers of Financial Assets [Line Items]      
Portfolio securitizations: unpaid principal balance $ 57,300 $ 48,300  
Unconsolidated VIEs [Member]      
Transfers of Financial Assets [Line Items]      
Retained interests: principal and interest received 257 $ 308  
Unconsolidated VIEs [Member] | Single Class MBS, REMIC & Megas [Member]      
Transfers of Financial Assets [Line Items]      
Retained interests: unpaid principal balance 4,300   $ 4,400
Retained interests: fair value $ 5,500   $ 5,800