VARIABLE INTEREST ENTITIES - Schedule of Variable Interest Entities (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Lending to special purpose entities included in loans and leases	[1]	$ 143,861	$ 154,679
Other assets	[1]	13,359	13,089
LIHTC unfunded commitments included in other liabilities	[1]	4,746	4,520
Asset-backed investments included in HTM securities	[2]	9,184	9,834
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Lending to special purpose entities included in loans and leases		4,760	4,578
LIHTC unfunded commitments included in other liabilities		1,025	1,046
Asset-backed investments included in HTM securities		488	581
Variable Interest Entity, Not Primary Beneficiary | Low Income Housing Tax Credit Partnerships
Variable Interest Entity [Line Items]
Other assets		2,444	2,230
Variable Interest Entity, Not Primary Beneficiary | Renewable Energy Investments
Variable Interest Entity [Line Items]
Other assets		314	374
Variable Interest Entity, Not Primary Beneficiary | New Market Tax Credit Investments
Variable Interest Entity [Line Items]
Other assets		$ 3	$ 4

[1] Includes amounts in consolidated VIEs. See Note 11 for additional information.

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