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Variable Interest Entities and Asset Securitizations - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Loss on securitization of assets $ 0 $ 0 $ 0
Other assets for its "investment" in the common securities recognized by the company of various trusts 23,000,000 23,000,000  
Total assets of partnerships in which the company invested 155,107,160,000 142,601,105,000  
Investment in partnership carrying amount 933,000,000 861,000,000  
Unfunded commitments includes carrrying amount of its investments 361,000,000 406,000,000  
Maximum exposure to loss of investments in real estate partnerships 1,200,000    
Variable Interest Entity Primary Beneficiary [Member]      
Total assets of partnerships in which the company invested $ 3,000,000,000.0 $ 2,300,000,000