Investments - Other Investments - Additional Information (Detail)	Dec. 31, 2023 USD ($) Investment Venture	Dec. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Non controlling interest certified low-income housing developments | Investment	5
Total liabilities	$ 40,800,500,000	$ 29,168,200,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Venture Capital Funds [Member]
Schedule of Equity Method Investments [Line Items]
Total liabilities	$ 600,000
Other Investments [Member] | Startup Venture [Member]
Schedule of Equity Method Investments [Line Items]
Non-controlling interest in startup venture number | Venture	2
Assets	$ 7,100,000
Other Investments [Member] | Four Venture Capital Funds [Member]
Schedule of Equity Method Investments [Line Items]
Assets	$ 3,200,000
Non controlling interest in venture capital funds number | Venture	4
Other Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Equity Method Investments [Line Items]
Assets	$ 4,400,000
Other Investments [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Five Certified Low-income Housing Developments [Member]
Schedule of Equity Method Investments [Line Items]
Carrying value of investments	$ 0