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LOANS AND LEASES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale $ 365   $ 325
Other loans held for sale 386   40
Residential mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged as collateral for FHLB borrowed funds 23,700   23,200
Loans pledged as collateral to support the contingent ability to borrow at the FRB discount window 15,600   15,900
Commercial loan syndication      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Other loans held for sale 13   40
Automobile      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans purchased during period 134 $ 393  
Residential portfolio segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans purchased during period 120 249  
Mortgage loans sold 173 273  
Student loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans purchased during period 369 261  
Commercial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans sold during the period 73 $ 111  
Level 2      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale 365   325
Other loans held for sale 0   0
Residential loans held for sale | Level 2      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale 292   268
Commercial real estate loans held for sale | Level 2      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale 73   $ 57
TDR Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Other loans held for sale 373    
TDR Loans | Home equity loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Other loans held for sale 85    
TDR Loans | Residential mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Other loans held for sale $ 288