SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Funding Commitments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Funding Commitments for Significant Unconsolidated VIEs
Total funding commitments	$ 16,883	$ 15,322
Liquidity facilities
Funding Commitments for Significant Unconsolidated VIEs
Total funding commitments	417	1,108
Loan/equity commitments
Funding Commitments for Significant Unconsolidated VIEs
Total funding commitments	16,466	14,214
Non-agency-sponsored mortgage securitizations | Liquidity facilities
Funding Commitments for Significant Unconsolidated VIEs
Total funding commitments	0	0
Non-agency-sponsored mortgage securitizations | Loan/equity commitments
Funding Commitments for Significant Unconsolidated VIEs
Total funding commitments	129	0
Asset-based financing | Liquidity facilities
Funding Commitments for Significant Unconsolidated VIEs
Total funding commitments	0	0
Asset-based financing | Loan/equity commitments
Funding Commitments for Significant Unconsolidated VIEs
Total funding commitments	13,655	10,726
Municipal securities tender option bond trusts (TOBs) | Liquidity facilities
Funding Commitments for Significant Unconsolidated VIEs
Total funding commitments	417	1,108
Municipal securities tender option bond trusts (TOBs) | Loan/equity commitments
Funding Commitments for Significant Unconsolidated VIEs
Total funding commitments	0	0
Municipal investments | Liquidity facilities
Funding Commitments for Significant Unconsolidated VIEs
Total funding commitments	0	0
Municipal investments | Loan/equity commitments
Funding Commitments for Significant Unconsolidated VIEs
Total funding commitments	2,587	3,420
Investment funds | Liquidity facilities
Funding Commitments for Significant Unconsolidated VIEs
Total funding commitments	0	0
Investment funds | Loan/equity commitments
Funding Commitments for Significant Unconsolidated VIEs
Total funding commitments	95	68
Other | Liquidity facilities
Funding Commitments for Significant Unconsolidated VIEs
Total funding commitments	0	0
Other | Loan/equity commitments
Funding Commitments for Significant Unconsolidated VIEs
Total funding commitments	$ 0	$ 0