Special Purpose Entities, Including Variable Interest Entities - Supplemental Information about Loans Held as Assets and Long-Term Debt Associated with Consolidated Variable Interest Entities (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Variable Interest Entities [Line Items]
Long-term debt	$ 501	$ 639
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entities [Line Items]
Long-term debt	2,956	3,107
Long-term debt, Estimated fair value	2,785	2,788
Loans Unpaid Principal Balance	1,988	1,977
Long Term Debt Unpaid Principal Balance	$ 3,133	$ 3,064