VARIABLE INTEREST ENTITIES - Schedule of Variable Interest Entities (Details) - USD ($) $ in Millions		Mar. 31, 2022	Dec. 31, 2021
Variable Interest Entity
Lending to special purpose entities included in loans and leases		$ 131,305	$ 128,163
Debt securities held to maturity, carrying value	[1]	2,056	2,242
LIHTC Investments
Variable Interest Entity
LIHTC investment included in other assets		2,130	1,978
LIHTC unfunded commitments included in other liabilities		1,050	927
Renewable Energy
Variable Interest Entity
Renewable energy investments included in other assets		417	429
Commercial and industrial | Special Purpose Entities
Variable Interest Entity
Lending to special purpose entities included in loans and leases		2,602	2,646
Asset-backed securities
Variable Interest Entity
Debt securities held to maturity, carrying value		686	737
Asset-backed securities | Asset-backed securities
Variable Interest Entity
Debt securities held to maturity, carrying value		$ 686	$ 737

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