VARIABLE INTEREST ENTITIES - Schedule of Variable Interest Entities (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Lending to special purpose entities included in loans and leases	[1],[2]	$ 116,660	$ 110,617
LIHTC Investments
Variable Interest Entity [Line Items]
LIHTC investment included in other assets		1,236	951
LIHTC unfunded commitments included in other liabilities		673	491
Renewable Energy
Variable Interest Entity [Line Items]
Renewable energy investments included in other assets		319	335
Commercial | Special Purpose Entities
Variable Interest Entity [Line Items]
Lending to special purpose entities included in loans and leases		$ 613	$ 0

[1] Excluded from the table above are loans held for sale totaling $1.3 billion and $718 million as of December 31, 2018 and 2017, respectively.

[2] Mortgage loans serviced for others by the Company’s subsidiaries are not included above, and amounted to $69.6 billion and $20.3 billion at December 31, 2018 and 2017, respectively.