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Securitizations, Net - Additional Information (Detail)
$ in Billions
9 Months Ended
Sep. 30, 2021
USD ($)
Securities
Securitization Financial Asset For Which Transfer Is Accounted As Sale [Line Items]  
Number of securitizations | Securities 17
Securitization loans $ 3.9
Issuing of securities to third parties $ 3.5
Minimum  
Securitization Financial Asset For Which Transfer Is Accounted As Sale [Line Items]  
Securities redemption when principal balance is less than a certain percentage 5.00%
Maturity dates of the securities 2044-09
Maximum  
Securitization Financial Asset For Which Transfer Is Accounted As Sale [Line Items]  
Securities redemption when principal balance is less than a certain percentage 30.00%
Maturity dates of the securities 2051-08