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Consolidations and Transfers of Financial Assets - Transfers of Financial Assets and Portfolio Securitizations (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Transfers of Financial Assets [Line Items]      
Portfolio securitizations: unpaid principal balance $ 35,500 $ 31,200  
Unconsolidated VIEs      
Transfers of Financial Assets [Line Items]      
Retained interests: principal and interest received 57 $ 64  
Unconsolidated VIEs | Single Class MBS, REMIC & Megas      
Transfers of Financial Assets [Line Items]      
Retained interests: unpaid principal balance 639   $ 661
Retained interests: fair value $ 1,000   $ 1,000