Consolidated Securitization Vehicles and Other Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entity, reporting entity involvement, maximum loss exposure, amount	$ 787		$ 787		$ 813
Non-Agency RMBS | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Unconsolidated VIEs, individual investments	830		830		871
Non-Agency RMBS | Minimum | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Unconsolidated VIEs, individual investments	1		1		1
Non-Agency RMBS | Maximum | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Unconsolidated VIEs, individual investments	21		21		$ 23
Subprime | Residential Mortgage
Variable Interest Entity [Line Items]
Financing receivable, purchases	$ 1,400	$ 728	$ 2,600	$ 2,200