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VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]    
Loans and leases [1],[2] $ 116,660,000,000 $ 110,617,000,000
LIHTC Investments    
Variable Interest Entity [Line Items]    
Net impairment losses recognized in earnings 0 0
Commercial | Special Purpose Entities    
Variable Interest Entity [Line Items]    
Loans and leases 613,000,000 $ 0
Undrawn commitments to extend credit | Special Purpose Entities    
Variable Interest Entity [Line Items]    
Undrawn commitments to extend credit $ 584,000,000  
[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.