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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments not Recorded at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities held to maturity, carrying value |  | $ 4,284 | $ 4,685
Securities held-to-maturity, fair value |  | 4,102 | 4,668
Equity securities, at cost, carrying value |  | 874 | 722
Equity securities, at cost, fair value |  | 874 | 722
Other loans held for sale, carrying value |  | 27 | 221
Other loans held for sale, fair value |  | 27 | 221
Loans and leases, carrying value | [1],[2] | 114,720 | 110,617
Loans and leases, fair value |  | 113,913 | 111,168
Deposits, carrying value |  | 117,075 | 115,089
Deposits, fair value |  | 116,892 | 115,039
Federal funds purchased and securities sold under agreements to repurchase, carrying value |  | 374 | 815
Federal funds purchased and securities sold under agreements to repurchase, fair value |  | 374 | 815
Other short-term borrowed funds, carrying value |  | 2,006 | 1,856
Other short-term borrowed funds, fair value |  | 2,006 | 1,856
Long-term borrowed funds, carrying value |  | 15,639 | 11,765
Long-term borrowed funds, fair value |  | 15,630 | 11,891
Level 1 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities held to maturity, carrying value |  | 0 | 0
Securities held-to-maturity, fair value |  | 0 | 0
Equity securities, at cost, carrying value |  | 0 | 0
Equity securities, at cost, fair value |  | 0 | 0
Other loans held for sale, carrying value |  | 0 | 0
Other loans held for sale, fair value |  | 0 | 0
Loans and leases, carrying value |  | 0 | 0
Loans and leases, fair value |  | 0 | 0
Deposits, carrying value |  | 0 | 0
Deposits, fair value |  | 0 | 0
Federal funds purchased and securities sold under agreements to repurchase, carrying value |  | 0 | 0
Federal funds purchased and securities sold under agreements to repurchase, fair value |  | 0 | 0
Other short-term borrowed funds, carrying value |  | 0 | 0
Other short-term borrowed funds, fair value |  | 0 | 0
Long-term borrowed funds, carrying value |  | 0 | 0
Long-term borrowed funds, fair value |  | 0 | 0
Level 2 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities held to maturity, carrying value |  | 4,284 | 4,685
Securities held-to-maturity, fair value |  | 4,102 | 4,668
Equity securities, at cost, carrying value |  | 874 | 722
Equity securities, at cost, fair value |  | 874 | 722
Other loans held for sale, carrying value |  | 0 | 0
Other loans held for sale, fair value |  | 0 | 0
Loans and leases, carrying value |  | 336 | 393
Loans and leases, fair value |  | 336 | 393
Deposits, carrying value |  | 117,075 | 115,089
Deposits, fair value |  | 116,892 | 115,039
Federal funds purchased and securities sold under agreements to repurchase, carrying value |  | 374 | 815
Federal funds purchased and securities sold under agreements to repurchase, fair value |  | 374 | 815
Other short-term borrowed funds, carrying value |  | 2,006 | 1,856
Other short-term borrowed funds, fair value |  | 2,006 | 1,856
Long-term borrowed funds, carrying value |  | 15,639 | 11,765
Long-term borrowed funds, fair value |  | 15,630 | 11,891
Level 3 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities held to maturity, carrying value |  | 0 | 0
Securities held-to-maturity, fair value |  | 0 | 0
Equity securities, at cost, carrying value |  | 0 | 0
Equity securities, at cost, fair value |  | 0 | 0
Other loans held for sale, carrying value |  | 27 | 221
Other loans held for sale, fair value |  | 27 | 221
Loans and leases, carrying value |  | 114,384 | 110,224
Loans and leases, fair value |  | 113,577 | 110,775
Deposits, carrying value |  | 0 | 0
Deposits, fair value |  | 0 | 0
Federal funds purchased and securities sold under agreements to repurchase, carrying value |  | 0 | 0
Federal funds purchased and securities sold under agreements to repurchase, fair value |  | 0 | 0
Other short-term borrowed funds, carrying value |  | 0 | 0
Other short-term borrowed funds, fair value |  | 0 | 0
Long-term borrowed funds, carrying value |  | 0 | 0
Long-term borrowed funds, fair value |  | $ 0 | $ 0
[1] | Excluded from the table above are loans held for sale totaling $1.3 billion and $718 million as of September 30, 2018 and December 31, 2017, respectively.
[2] | Mortgage loans serviced for others by the Company’s subsidiaries are not included above, and amounted to $67.5 billion and $20.3 billion at September 30, 2018 and December 31, 2017, respectively.

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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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