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Securitization Activities - Amount of Financial Assets Securitized and Cash Flows Received on Retained Interests (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Servicing Assets at Fair Value [Line Items]        
Residential mortgages $ 15,270 $ 10,708 $ 41,681 $ 22,588
Commercial mortgages 4,538 1,600 13,335 4,201
Other financial assets 1,181 1,046 2,711 1,268
Total financial assets securitized 20,989 13,354 57,727 28,057
Retained interests cash flows $ 212 $ 218 $ 551 $ 503