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Consolidations and Transfers of Financial Assets - Transfers of Financial Assets and Portfolio Securitizations (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Transfers of Financial Assets [Line Items]          
Portfolio securitizations: unpaid principal balance $ 35,500 $ 36,900 $ 66,700 $ 65,200  
Unconsolidated VIEs          
Transfers of Financial Assets [Line Items]          
Retained interests: principal and interest received 63 $ 70 127 $ 148  
Unconsolidated VIEs | Single Class MBS, REMIC & Megas          
Transfers of Financial Assets [Line Items]          
Retained interests: unpaid principal balance 699   699   $ 821
Retained interests: fair value $ 1,100   $ 1,100   $ 1,300