VARIABLE INTEREST ENTITIES - Schedule of Variable Interest Entities (Details) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Lending to special purpose entities included in loans and leases		$ 128,163	$ 123,090
Investment in asset-backed securities included in HTM securities	[1]	2,242	3,235
LIHTC Investments
Variable Interest Entity [Line Items]
LIHTC investment included in other assets		1,978	1,687
LIHTC unfunded commitments included in other liabilities		927	875
Renewable Energy
Variable Interest Entity [Line Items]
Renewable energy investments included in other assets		429	403
Commercial and industrial | Special Purpose Entities
Variable Interest Entity [Line Items]
Lending to special purpose entities included in loans and leases		2,646	1,295
Asset-Backed Securities
Variable Interest Entity [Line Items]
Investment in asset-backed securities included in HTM securities		737	893
Asset-Backed Securities | Asset-Backed Securities
Variable Interest Entity [Line Items]
Investment in asset-backed securities included in HTM securities		$ 737	$ 893

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