SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Funding Commitments (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Funding Commitments for Significant Unconsolidated VIEs
Notional amount	$ 15,322	$ 17,266
Liquidity facilities
Funding Commitments for Significant Unconsolidated VIEs
Notional amount	1,108	1,498
Loan / equity commitments
Funding Commitments for Significant Unconsolidated VIEs
Notional amount	14,214	15,768
Non-agency-sponsored mortgage securitizations | Liquidity facilities
Funding Commitments for Significant Unconsolidated VIEs
Notional amount	0	0
Non-agency-sponsored mortgage securitizations | Loan / equity commitments
Funding Commitments for Significant Unconsolidated VIEs
Notional amount	0	5
Asset-based financing | Liquidity facilities
Funding Commitments for Significant Unconsolidated VIEs
Notional amount	0	0
Asset-based financing | Loan / equity commitments
Funding Commitments for Significant Unconsolidated VIEs
Notional amount	10,726	12,189
Municipal securities tender option bond trusts (TOBs) | Liquidity facilities
Funding Commitments for Significant Unconsolidated VIEs
Notional amount	1,108	1,498
Municipal securities tender option bond trusts (TOBs) | Loan / equity commitments
Funding Commitments for Significant Unconsolidated VIEs
Notional amount	0	0
Municipal investments | Liquidity facilities
Funding Commitments for Significant Unconsolidated VIEs
Notional amount	0	0
Municipal investments | Loan / equity commitments
Funding Commitments for Significant Unconsolidated VIEs
Notional amount	3,420	3,562
Investment funds | Liquidity facilities
Funding Commitments for Significant Unconsolidated VIEs
Notional amount	0	0
Investment funds | Loan / equity commitments
Funding Commitments for Significant Unconsolidated VIEs
Notional amount	68	12
Other | Liquidity facilities
Funding Commitments for Significant Unconsolidated VIEs
Notional amount	0	0
Other | Loan / equity commitments
Funding Commitments for Significant Unconsolidated VIEs
Notional amount	$ 0	$ 0