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LOANS AND LEASES - Commercial Loans and Leases by Credit Quality (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	$ 22,543	$ 22,153
Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	8,832	8,786
Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	5,028	4,556
Commercial Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	385	373
Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	37	46
Total Commercial Loans and Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	14,282	13,761
Originated Loans and Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	19,050	18,062
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	6,601	6,171
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	4,708	4,140
Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	385	373
Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	37	46
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	11,731	10,730
Acquired Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	3,493	4,091
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	2,231	2,615
Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	320	416
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	2,551	3,031
Pass [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	6,309	5,883
Pass [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	4,419	3,879
Pass [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	375	366
Pass [Member] | Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	36	45
Pass [Member] | Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	11,139	10,173
Pass [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	1,926	2,256
Pass [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	274	355
Pass [Member] | Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	2,200	2,611
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	146	163
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	162	180
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	4	1
Special Mention [Member] | Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	0	0
Special Mention [Member] | Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	312	344
Special Mention [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	147	168
Special Mention [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	17	18
Special Mention [Member] | Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	164	186
Substandard [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	145	125
Substandard [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	126	81
Substandard [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	6	6
Substandard [Member] | Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	1	1
Substandard [Member] | Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	278	213
Substandard [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	158	191
Substandard [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	29	43
Substandard [Member] | Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	187	234
Doubtful [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	1	0
Doubtful [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	1	0
Doubtful [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	0	0
Doubtful [Member] | Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	0	0
Doubtful [Member] | Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	2	0
Doubtful [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	0	0
Doubtful [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	0	0
Doubtful [Member] | Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Total commercial loans and leases	$ 0	$ 0

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524

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