VARIABLE INTEREST ENTITIES - Schedule of Variable Interest Entities (Details) - USD ($) $ in Millions		Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entity
Lending to special purpose entities included in loans and leases		$ 124,071	$ 119,088
Securities available for sale	[1]	22,884	20,613
Special Purpose Entities | Commercial
Variable Interest Entity
Lending to special purpose entities included in loans and leases		1,173	1,101
LIHTC Investments
Variable Interest Entity
LIHTC investment included in other assets		1,543	1,401
LIHTC unfunded commitments included in other liabilities		810	716
Renewable Energy
Variable Interest Entity
Renewable energy investments included in other assets		410	355
Asset-backed securities
Variable Interest Entity
Securities available for sale		813	0
Asset-backed securities | Asset-backed securities
Variable Interest Entity
Securities available for sale		$ 813	$ 0

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