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LOANS AND LEASES - Net of Unearned Income (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Document Period End Date | Jun. 30, 2019 |
Loans and leases, net of unearned income | $ 22,543 | $ 22,153
Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 8,832 | 8,786
Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 5,028 | 4,556
Commercial Leases [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 385 | 373
Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 37 | 46
Total Commercial Loans and Leases [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 14,282 | 13,761
Direct Installment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 1,758 | 1,764
Residential Mortgages [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 3,022 | 3,113
Indirect Installment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 1,968 | 1,933
Consumer Lines of Credit [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 1,513 | 1,582
Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 8,261 | 8,392
Originated Loans and Leases [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 19,050 | 18,062
Originated Loans and Leases [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 6,601 | 6,171
Originated Loans and Leases [Member] | Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 4,708 | 4,140
Originated Loans and Leases [Member] | Commercial Leases [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 385 | 373
Originated Loans and Leases [Member] | Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 37 | 46
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 11,731 | 10,730
Originated Loans and Leases [Member] | Direct Installment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 1,679 | 1,668
Originated Loans and Leases [Member] | Residential Mortgages [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 2,573 | 2,612
Originated Loans and Leases [Member] | Indirect Installment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 1,968 | 1,933
Originated Loans and Leases [Member] | Consumer Lines of Credit [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 1,099 | 1,119
Originated Loans and Leases [Member] | Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 7,319 | 7,332
Loans Acquired in a Business Combination [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 3,493 | 4,091
Loans Acquired in a Business Combination [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 2,231 | 2,615
Loans Acquired in a Business Combination [Member] | Commercial and Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 320 | 416
Loans Acquired in a Business Combination [Member] | Commercial Leases [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 0 | 0
Loans Acquired in a Business Combination [Member] | Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 0 | 0
Loans Acquired in a Business Combination [Member] | Total Commercial Loans and Leases [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 2,551 | 3,031
Loans Acquired in a Business Combination [Member] | Direct Installment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 79 | 96
Loans Acquired in a Business Combination [Member] | Residential Mortgages [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 449 | 501
Loans Acquired in a Business Combination [Member] | Indirect Installment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 0 | 0
Loans Acquired in a Business Combination [Member] | Consumer Lines of Credit [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | 414 | 463
Loans Acquired in a Business Combination [Member] | Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and leases, net of unearned income | $ 942 | $ 1,060

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