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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments not Recorded at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities held to maturity, carrying value | [1] | $ 2,995 | $ 3,235
Securities held-to-maturity, fair value |  | 3,077 | 3,357
Other loans held for sale, carrying value |  | 75 | 439
Other loans held for sale, fair value |  | 75 | 439
Loans and leases |  | 122,195 | 123,090
Loans and leases, fair value |  | 122,365 | 123,678
Equity securities, at cost, carrying value |  | 603 | 604
Equity securities, at cost, fair value |  | 603 | 604
Deposits, carrying value |  | 151,349 | 147,164
Deposits, fair value |  | 151,384 | 147,223
Short-term borrowed funds, carrying value |  | 70 | 243
Short-term borrowed funds, fair value |  | 70 | 243
Long-term borrowed funds, carrying value |  | 8,316 | 8,346
Long-term borrowed funds, fair value |  | 8,618 | 8,850
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
Other loans held for sale, carrying value |  | 0 | 0
Other loans held for sale, fair value |  | 0 | 0
Loans and leases |  | 0 | 0
Loans and leases, fair value |  | 0 | 0
Equity securities, at cost, carrying value |  | 0 | 0
Equity securities, at cost, fair value |  | 0 | 0
Deposits, carrying value |  | 0 | 0
Deposits, fair value |  | 0 | 0
Short-term borrowed funds, carrying value |  | 0 | 0
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 |  | 2,139 | 2,342
Securities held-to-maturity, fair value |  | 2,223 | 2,464
Other loans held for sale, carrying value |  | 0 | 0
Other loans held for sale, fair value |  | 0 | 0
Loans and leases |  | 724 | 758
Loans and leases, fair value |  | 724 | 758
Equity securities, at cost, carrying value |  | 595 | 596
Equity securities, at cost, fair value |  | 595 | 596
Deposits, carrying value |  | 151,349 | 147,164
Deposits, fair value |  | 151,384 | 147,223
Short-term borrowed funds, carrying value |  | 70 | 243
Short-term borrowed funds, fair value |  | 70 | 243
Long-term borrowed funds, carrying value |  | 8,316 | 8,346
Long-term borrowed funds, fair value |  | 8,618 | 8,850
Level 3 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities held to maturity, carrying value |  | 856 | 893
Securities held-to-maturity, fair value |  | 854 | 893
Other loans held for sale, carrying value |  | 75 | 439
Other loans held for sale, fair value |  | 75 | 439
Loans and leases |  | 121,471 | 122,332
Loans and leases, fair value |  | 121,641 | 122,920
Equity securities, at cost, carrying value |  | 8 | 8
Equity securities, at cost, fair value |  | 8 | 8
Deposits, carrying value |  | 0 | 0
Deposits, fair value |  | 0 | 0
Short-term borrowed funds, carrying value |  | 0 | 0
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] | Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.

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- Definition The amount of other loans receivable that will be sold to other entities. + References No definition available. + Details
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- Definition Fair value portion of other loans receivable held-for-sale. + References No definition available. + Details
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- Definition Total Other Investment Securities At Cost, Amortized Cost Basis + References No definition available. + Details
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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=120398452&loc=d3e534808-122878 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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