Variable Interest Entities - Supplemental Information about Loans Held as Assets and Long-Term Debt Associated with Consolidated Variable Interest Entities (Detail) - Variable Interest Entity [Member] - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Variable Interest Entities [Line Items]
Long-term Debt, Fair Value	$ 2,788	$ 4,056
Loans, Unpaid principal balance	1,977	2,363
Long-term debt, Unpaid principal balance	$ 3,064	$ 3,579