VARIABLE INTEREST ENTITIES - Schedule of Unconsolidated Variable Interest Entities (Details) - USD ($) $ in Millions		Sep. 30, 2023	Dec. 31, 2022
Variable Interest Entity
Lending to special purpose entities included in loans and leases	[1]	$ 147,666	$ 154,679
Investments included in other assets	[1]	13,613	13,089
LIHTC unfunded commitments included in other liabilities	[1]	4,500	4,520
Asset-backed investments included in HTM securities	[2]	9,320	9,834
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity
Lending to special purpose entities included in loans and leases		4,860	4,578
LIHTC unfunded commitments included in other liabilities		1,045	1,046
Asset-backed investments included in HTM securities		510	581
Variable Interest Entity, Not Primary Beneficiary | Low Income Housing Tax Credit Partnerships
Variable Interest Entity
Investments included in other assets		2,395	2,230
Variable Interest Entity, Not Primary Beneficiary | Renewable Energy
Variable Interest Entity
Investments included in other assets		243	374
Variable Interest Entity, Not Primary Beneficiary | New Market Tax Credit Investments
Variable Interest Entity
Investments included in other assets		$ 3	$ 4

[1] Includes amounts in consolidated VIEs. See Note 7 for additional information.

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