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, 2019
Dec. 31, 2018
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 $ 181 $ 224
Impaired loans and leases with no related allowance, unpaid principle 215 261
Impaired loans and leases with no related allowance, average balance 204 256
Impaired loans and leases with no related allowance, interest income recognized 19 22
Impaired loans and leases with an allowance recorded, ending balance 366 221
Impaired loans and leases with an allowance recorded, unpaid principle 425 240
Impaired loans and leases with an allowance recorded, related allowance 60 31
Impaired Financing Receivable, Average Recorded Investment 516 528
Impaired loans and leases with an allowance recorded, average balance 312 272
Impaired loans and leases with an allowance recorded, interest income recognized 11 11
Considered impaired due to TDR status 322 366
Impaired Financing Receivable, Recorded Investment 547 445
Impaired Financing Receivable, Unpaid Principal Balance 640 501
Impaired Financing Receivable, Interest Income, Accrual Method 30 33
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 25 36
Impaired loans and leases with no related allowance, unpaid principle 26 45
Impaired loans and leases with no related allowance, average balance 32 47
Impaired loans and leases with no related allowance, interest income recognized 8 8
Impaired loans and leases with an allowance recorded, ending balance 28 35
Impaired loans and leases with an allowance recorded, unpaid principle 31 39
Impaired loans and leases with an allowance recorded, related allowance 1 2
Impaired Financing Receivable, Average Recorded Investment 63 92
Impaired loans and leases with an allowance recorded, average balance 31 45
Impaired loans and leases with an allowance recorded, interest income recognized 2 2
Considered impaired due to TDR status 43 60
Impaired Financing Receivable, Recorded Investment 53 71
Impaired Financing Receivable, Unpaid Principal Balance 57 84
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 43 38
Impaired loans and leases with an allowance recorded, unpaid principle 46 42
Impaired loans and leases with an allowance recorded, related allowance 2 2
Impaired Financing Receivable, Average Recorded Investment 40 37
Impaired loans and leases with an allowance recorded, average balance 40 37
Impaired loans and leases with an allowance recorded, interest income recognized 3 2
Impaired Financing Receivable, Recorded Investment 43 38
Impaired Financing Receivable, Unpaid Principal Balance 46 42
Impaired Financing Receivable, Interest Income, Accrual Method 3 2
Consumer | Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with an allowance recorded, ending balance 284 314
Impaired loans and leases with an allowance recorded, unpaid principle 281 356
Impaired loans and leases with an allowance recorded, related allowance 9 10
Impaired Financing Receivable, Average Recorded Investment 300 326
Impaired loans and leases with an allowance recorded, average balance 300 326
Impaired loans and leases with an allowance recorded, interest income recognized 14 14
Impaired Financing Receivable, Recorded Investment 284 314
Impaired Financing Receivable, Unpaid Principal Balance 281 356
Impaired Financing Receivable, Interest Income, Accrual Method 14 14
Consumer | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with an allowance recorded, ending balance 293 287
Impaired loans and leases with an allowance recorded, unpaid principle 329 323
Impaired loans and leases with an allowance recorded, related allowance 4 4
Impaired Financing Receivable, Average Recorded Investment 288 297
Impaired loans and leases with an allowance recorded, average balance 288 297
Impaired loans and leases with an allowance recorded, interest income recognized 11 11
Impaired Financing Receivable, Recorded Investment 293 287
Impaired Financing Receivable, Unpaid Principal Balance 329 323
Impaired Financing Receivable, Interest Income, Accrual Method 11 11
Consumer | RV and marine finance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with an allowance recorded, ending balance 4 2
Impaired loans and leases with an allowance recorded, unpaid principle 4 3
Impaired loans and leases with an allowance recorded, related allowance 0 0
Impaired Financing Receivable, Average Recorded Investment 3 2
Impaired loans and leases with an allowance recorded, average balance 3 2
Impaired loans and leases with an allowance recorded, interest income recognized 0 0
Impaired Financing Receivable, Recorded Investment 4 2
Impaired Financing Receivable, Unpaid Principal Balance 4 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 11 9
Impaired loans and leases with an allowance recorded, unpaid principle 11 9
Impaired loans and leases with an allowance recorded, related allowance 2 3
Impaired Financing Receivable, Average Recorded Investment 10 8
Impaired loans and leases with an allowance recorded, average balance 10 8
Impaired loans and leases with an allowance recorded, interest income recognized 0 0
Impaired Financing Receivable, Recorded Investment 11 9
Impaired Financing Receivable, Unpaid Principal Balance 11 9
Impaired Financing Receivable, Interest Income, Accrual Method $ 0 $ 0