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Consolidations and Transfers of Financial Assets Transfers of Financial Assets (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Transfers of Financial Assets [Line Items]          
Document Period End Date     Jun. 30, 2019    
Portfolio securitizations: unpaid principal balance $ 57,300 $ 51,600 $ 98,700 $ 115,900  
Unconsolidated VIEs [Member]          
Transfers of Financial Assets [Line Items]          
Retained interests: principal and interest received 122 $ 128 238 $ 354  
Unconsolidated VIEs [Member] | Single Class MBS, REMIC & Megas [Member]          
Transfers of Financial Assets [Line Items]          
Retained interests: unpaid principal balance 2,700   2,700   $ 1,500
Retained interests: fair value $ 3,700   $ 3,700   $ 2,200