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VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Variable Interest Entity          
Lending to special purpose entities included in loans and leases [1],[2] $ 114,720   $ 114,720   $ 110,617
LIHTC Investments          
Variable Interest Entity          
Net impairment losses recognized in earnings 0 $ 0 0 $ 0  
Commercial | Special Purpose Entities          
Variable Interest Entity          
Lending to special purpose entities included in loans and leases 449   449   $ 0
Undrawn commitments to extend credit | Special Purpose Entities          
Variable Interest Entity          
Commitment amount $ 534   $ 534    
[1] Excluded from the table above are loans held for sale totaling $1.3 billion and $718 million as of September 30, 2018 and December 31, 2017, respectively.
[2] Mortgage loans serviced for others by the Company’s subsidiaries are not included above, and amounted to $67.5 billion and $20.3 billion at September 30, 2018 and December 31, 2017, respectively.