Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Impaired Loans (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Impaired Loans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Commercial Portfolio Segment [Member] | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, ending balance $ 224 $ 284
Impaired loans and leases with no related allowance, unpaid principle 261 311
Impaired loans and leases with no related allowance, average balance 256 206
Impaired loans and leases with no related allowance, interest income recognized 22 12
Impaired loans and leases with an allowance recorded, ending balance 221 257
Impaired loans and leases with an allowance recorded, unpaid principle 240 280
Impaired loans and leases with an allowance recorded, related allowance 31 29
Impaired Financing Receivable, Average Recorded Investment 528 498
Impaired loans and leases with an allowance recorded, average balance 272 292
Impaired loans and leases with an allowance recorded, interest income recognized 11 16
Considered impaired due to TDR status 366 382
Impaired Financing Receivable, Recorded Investment 445 541
Impaired Financing Receivable, Unpaid Principal Balance 501 591
Impaired Financing Receivable, Interest Income, Accrual Method 33 28
Commercial Portfolio Segment [Member] | Commercial Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, ending balance 36 56
Impaired loans and leases with no related allowance, unpaid principle 45 81
Impaired loans and leases with no related allowance, average balance 47 64
Impaired loans and leases with no related allowance, interest income recognized 8 8
Impaired loans and leases with an allowance recorded, ending balance 35 51
Impaired loans and leases with an allowance recorded, unpaid principle 39 51
Impaired loans and leases with an allowance recorded, related allowance 2 3
Impaired Financing Receivable, Average Recorded Investment 92 116
Impaired loans and leases with an allowance recorded, average balance 45 52
Impaired loans and leases with an allowance recorded, interest income recognized 2 2
Considered impaired due to TDR status 60 93
Impaired Financing Receivable, Recorded Investment 71 107
Impaired Financing Receivable, Unpaid Principal Balance 84 132
Impaired Financing Receivable, Interest Income, Accrual Method 10 10
Consumer | Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with an allowance recorded, ending balance 38 36
Impaired loans and leases with an allowance recorded, unpaid principle 42 40
Impaired loans and leases with an allowance recorded, related allowance 2 2
Impaired Financing Receivable, Average Recorded Investment 37 33
Impaired loans and leases with an allowance recorded, average balance 37 33
Impaired loans and leases with an allowance recorded, interest income recognized 2 2
Impaired Financing Receivable, Recorded Investment 38 36
Impaired Financing Receivable, Unpaid Principal Balance 42 40
Impaired Financing Receivable, Interest Income, Accrual Method 2 2
Consumer | Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with an allowance recorded, ending balance 314 334
Impaired loans and leases with an allowance recorded, unpaid principle 356 385
Impaired loans and leases with an allowance recorded, related allowance 10 14
Impaired Financing Receivable, Average Recorded Investment 326 329
Impaired loans and leases with an allowance recorded, average balance 326 329
Impaired loans and leases with an allowance recorded, interest income recognized 14 15
Impaired Financing Receivable, Recorded Investment 314 334
Impaired Financing Receivable, Unpaid Principal Balance 356 385
Impaired Financing Receivable, Interest Income, Accrual Method 14 15
Consumer | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with an allowance recorded, ending balance 287 308
Impaired loans and leases with an allowance recorded, unpaid principle 323 338
Impaired loans and leases with an allowance recorded, related allowance 4 4
Impaired Financing Receivable, Average Recorded Investment 297 325
Impaired loans and leases with an allowance recorded, average balance 297 325
Impaired loans and leases with an allowance recorded, interest income recognized 11 12
Impaired Financing Receivable, Recorded Investment 287 308
Impaired Financing Receivable, Unpaid Principal Balance 323 338
Impaired Financing Receivable, Interest Income, Accrual Method 11 12
Consumer | RV and marine finance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with an allowance recorded, ending balance 2 2
Impaired loans and leases with an allowance recorded, unpaid principle 3 3
Impaired loans and leases with an allowance recorded, related allowance 0 0
Impaired Financing Receivable, Average Recorded Investment 2 1
Impaired loans and leases with an allowance recorded, average balance 2 1
Impaired loans and leases with an allowance recorded, interest income recognized 0 0
Impaired Financing Receivable, Recorded Investment 2 2
Impaired Financing Receivable, Unpaid Principal Balance 3 3
Impaired Financing Receivable, Interest Income, Accrual Method 0 0
Consumer | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with an allowance recorded, ending balance 9 8
Impaired loans and leases with an allowance recorded, unpaid principle 9 8
Impaired loans and leases with an allowance recorded, related allowance 3 2
Impaired Financing Receivable, Average Recorded Investment 8 5
Impaired loans and leases with an allowance recorded, average balance 8 5
Impaired loans and leases with an allowance recorded, interest income recognized 0 0
Impaired Financing Receivable, Recorded Investment 9 8
Impaired Financing Receivable, Unpaid Principal Balance 9 8
Impaired Financing Receivable, Interest Income, Accrual Method $ 0 $ 0