Variable Interest Entities and Asset Securitizations - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Aug. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Loss on securitization of assets		$ 0
Loans and leases		131,939,000,000	$ 129,639,000,000
Asset-backed notes		474,000,000
Remaining balance of loans and leases		134,936,000,000	132,074,000,000
Other assets for its "investment" in the common securities recognized by the company of various trusts		22,000,000	22,000,000
Total assets of partnerships in which the company invested		208,264,000,000	200,730,000,000
Investment in partnership carrying amount		1,500,000,000	1,500,000,000
Unfunded commitments includes carrrying amount of its investments		441,000,000	545,000,000
Contingent Commitments to Provide Additional Capital Contributions to Partnerships		55,000,000
Maximum exposure to loss of investments in real estate partnerships		2,100,000,000
Asset-Backed Notes [Member]
Loans and leases	$ 666,000,000
Senior notes	$ 550,000,000
Asset-backed notes weighed average estimated life	2 years
Loans and leases average rate	5.84%
Asset-backed notes	$ 88,000,000	474,000,000
Remaining balance of loans and leases		599,000,000
Variable Interest Entity Primary Beneficiary [Member]
Total assets of partnerships in which the company invested		$ 9,800,000,000	$ 9,200,000,000