Consolidated Securitization Vehicles and Other Variable Interest Entities - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entity, reporting entity involvement, maximum loss exposure, amount	$ 886		$ 886		$ 1,200
Non-Agency RMBS | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Unconsolidated VIEs, individual investments (Less than $1 million)	1,000		1,000		1,400
Non-Agency RMBS | Minimum | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Unconsolidated VIEs, individual investments (Less than $1 million)	1		1		1
Non-Agency RMBS | Maximum | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Unconsolidated VIEs, individual investments (Less than $1 million)	26		26		$ 220
Subprime | Residential Mortgage
Variable Interest Entity [Line Items]
Financing receivable, purchases	$ 728	$ 1,500	$ 2,200	$ 5,600