Special Purpose Entities, Including Variable Interest Entities - Summary of Fair Value of Fixed Income Securities, by Asset-Type, Held by Consolidated Variable Interest Entities (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Variable Interest Entities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 2,060
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	33	$ 141
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	116	16
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entities [Line Items]
Loans Unpaid Principal Balance	1,878	2,363
Long Term Debt Unpaid Principal Balance	2,884	3,579
Variable Interest Entity, Primary Beneficiary [Member] | Municipal Bonds [Member]
Variable Interest Entities [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	98	106
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	$ 29
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	$ (6)