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LOANS AND LEASES - Impaired Loans and Lease (Detail) - Originated Loans and Leases [Member] - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Financial Receivables Impaired Or Restructured [Line Items] |  |
Unpaid Contractual Principal Balance | $ 102 | $ 113
Recorded Investment With No Specific Reserve | 75 | 73
Recorded Investment With Specific Reserve | 6 | 14
Total Recorded Investment | 81 | 87
Specific Reserve | 3 | 4
Average Recorded Investment | 79 | 90
Commercial Real Estate [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Unpaid Contractual Principal Balance | 31 | 20
Recorded Investment With No Specific Reserve | 21 | 16
Recorded Investment With Specific Reserve | 6 | 1
Total Recorded Investment | 27 | 17
Specific Reserve | 2 | 0
Average Recorded Investment | 24 | 18
Commercial and Industrial [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Unpaid Contractual Principal Balance | 22 | 46
Recorded Investment With No Specific Reserve | 15 | 20
Recorded Investment With Specific Reserve | 0 | 13
Total Recorded Investment | 15 | 33
Specific Reserve | 1 | 4
Average Recorded Investment | 17 | 32
Commercial Leases [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Unpaid Contractual Principal Balance | 2 | 2
Recorded Investment With No Specific Reserve | 2 | 2
Recorded Investment With Specific Reserve | 0 | 0
Total Recorded Investment | 2 | 2
Specific Reserve | 0 | 0
Average Recorded Investment | 2 | 4
Total Commercial Loans and Leases [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Unpaid Contractual Principal Balance | 55 | 68
Recorded Investment With No Specific Reserve | 38 | 38
Recorded Investment With Specific Reserve | 6 | 14
Total Recorded Investment | 44 | 52
Specific Reserve | 3 | 4
Average Recorded Investment | 43 | 54
Direct Installment [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Unpaid Contractual Principal Balance | 17 | 17
Recorded Investment With No Specific Reserve | 14 | 14
Recorded Investment With Specific Reserve | 0 | 0
Total Recorded Investment | 14 | 14
Specific Reserve | 0 | 0
Average Recorded Investment | 14 | 14
Residential Mortgages [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Unpaid Contractual Principal Balance | 18 | 16
Recorded Investment With No Specific Reserve | 16 | 14
Recorded Investment With Specific Reserve | 0 | 0
Total Recorded Investment | 16 | 14
Specific Reserve | 0 | 0
Average Recorded Investment | 15 | 15
Indirect Installment [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Unpaid Contractual Principal Balance | 5 | 5
Recorded Investment With No Specific Reserve | 2 | 2
Recorded Investment With Specific Reserve | 0 | 0
Total Recorded Investment | 2 | 2
Specific Reserve | 0 | 0
Average Recorded Investment | 2 | 2
Consumer Lines of Credit [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Unpaid Contractual Principal Balance | 7 | 7
Recorded Investment With No Specific Reserve | 5 | 5
Recorded Investment With Specific Reserve | 0 | 0
Total Recorded Investment | 5 | 5
Specific Reserve | 0 | 0
Average Recorded Investment | 5 | 5
Consumer Loan [Member] |  |
Financial Receivables Impaired Or Restructured [Line Items] |  |
Unpaid Contractual Principal Balance | 47 | 45
Recorded Investment With No Specific Reserve | 37 | 35
Recorded Investment With Specific Reserve | 0 | 0
Total Recorded Investment | 37 | 35
Specific Reserve | 0 | 0
Average Recorded Investment | $ 36 | $ 36

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