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Securitizations, Net - Additional Information (Detail)
$ in Billions
6 Months Ended
Jun. 30, 2021
USD ($)
Securities
Securitization Financial Asset For Which Transfer Is Accounted As Sale [Line Items]  
Number of securitizations | Securities 16
Securitization loans $ 3.7
Issuing of securities to third parties $ 3.3
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 2051-05