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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Transfers of Financial Assets [Line Items]          
Portfolio securitizations: unpaid principal balance $ 51,600 $ 69,200 $ 115,900 $ 126,500  
Unconsolidated VIEs [Member]          
Transfers of Financial Assets [Line Items]          
Retained interests: principal and interest received 128 $ 303 354 $ 560  
Unconsolidated VIEs [Member] | Single Class MBS, REMIC & Megas [Member]          
Transfers of Financial Assets [Line Items]          
Retained interests: unpaid principal balance 1,600   1,600   $ 3,900
Retained interests: fair value $ 2,500   $ 2,500   $ 4,700