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VARIABLE INTEREST ENTITIES - Schedule of Variable Interest Entities (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Lending to special purpose entities included in loans and leases		$ 123,090	$ 119,088
Investment in asset-backed securities included in HTM securities	[1]	3,235	3,202
LIHTC Investments
Variable Interest Entity [Line Items]
LIHTC investment included in other assets		1,687	1,401
LIHTC unfunded commitments included in other liabilities		875	716
Renewable Energy
Variable Interest Entity [Line Items]
Renewable energy investments included in other assets		403	355
Commercial and industrial | Special Purpose Entities
Variable Interest Entity [Line Items]
Lending to special purpose entities included in loans and leases		1,295	1,101
Asset-backed securities
Variable Interest Entity [Line Items]
Investment in asset-backed securities included in HTM securities		893	0
Asset-backed securities | Asset-backed securities
Variable Interest Entity [Line Items]
Investment in asset-backed securities included in HTM securities		$ 893	$ 0
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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