Variable Interest Entities - Schedule of Repurchase Agreements (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Agreements to repurchase, gross carrying value	$ 3,853	$ 4,743
VIE, Primary Beneficiary
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Agreements to repurchase, gross carrying value	0	1,254
Loans backed by residential real estate \| Residential Real Estate \| VIE, Primary Beneficiary
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Agreements to repurchase, gross carrying value	0	770
Loans backed by commercial real estate \| Commercial Real Estate \| VIE, Primary Beneficiary
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Agreements to repurchase, gross carrying value	0	484
91 days to 364 days \| VIE, Primary Beneficiary
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Agreements to repurchase, gross carrying value	$ 0	$ 1,254