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Consolidations and Transfers of Financial Assets - Transfers of Financial Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Transfers of Financial Assets [Line Items]      
Portfolio securitizations: unpaid principal balance $ 139,700 $ 131,600 $ 270,500
Unconsolidated VIEs      
Transfers of Financial Assets [Line Items]      
Retained interests: principal and interest received 253 282 $ 397
Unconsolidated VIEs | Single Class MBS, REMIC & Megas      
Transfers of Financial Assets [Line Items]      
Retained interests: unpaid principal balance 661 821  
Retained interest: fair value $ 1,000 $ 1,300