VARIABLE INTEREST ENTITIES - Schedule of Unconsolidated Variable Interest Entities (Details) - USD ($) $ in Millions		Mar. 31, 2024	Dec. 31, 2023
Variable Interest Entity
Lending to special purpose entities included in loans and leases	[1]	$ 141,102	$ 143,861
Investments included in other assets	[1]	13,571	13,359
LIHTC unfunded commitments included in other liabilities	[1]	4,741	4,746
Asset-backed investments included in HTM securities	[2]	9,054	9,184
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
Lending to special purpose entities included in loans and leases		4,737	4,760
LIHTC unfunded commitments included in other liabilities		1,046	1,025
Asset-backed investments included in HTM securities		467	488
Variable Interest Entity, Not Primary Beneficiary | Low Income Housing Tax Credit Partnerships
Variable Interest Entity
Investments included in other assets		2,472	2,444
Variable Interest Entity, Not Primary Beneficiary | Renewable Energy
Variable Interest Entity
Investments included in other assets		298	314
Variable Interest Entity, Not Primary Beneficiary | New Market Tax Credit Investments
Variable Interest Entity
Investments included in other assets		$ 3	$ 3

[1] Includes amounts in consolidated VIEs. See Note 6 for additional information.

[2] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.