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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments not Recorded at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Financial assets: |  |  |
Securities held to maturity, carrying value | [1] | $ 2,242 | $ 3,235
Securities held-to-maturity, fair value |  | 2,289 | 3,357
Other loans held for sale, carrying value |  | 735 | 439
Other loans held for sale, fair value |  | 735 | 439
Loans and leases |  | 128,163 | 123,090
Loans and leases, fair value |  | 128,156 | 123,678
Other investment securities, at cost, carrying value |  | 624 | 604
Other investment securities, at cost, estimated fair value |  | 624 | 604
Financial liabilities: |  |  |
Deposits, carrying value |  | 154,361 | 147,164
Deposits, fair value |  | 154,366 | 147,223
Short-term borrowed funds |  | 74 | 243
Short-term borrowed funds, fair value |  | 74 | 243
Long-term borrowed funds, carrying value |  | 6,932 | 8,346
Long-term borrowed funds, fair value |  | 7,188 | 8,850
Level 1 |  |  |
Financial assets: |  |  |
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
Other investment securities, at cost, carrying value |  | 0 | 0
Other investment securities, at cost, estimated fair value |  | 0 | 0
Financial liabilities: |  |  |
Deposits, carrying value |  | 0 | 0
Deposits, fair value |  | 0 | 0
Short-term borrowed funds |  | 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 |  |  |
Financial assets: |  |  |
Securities held to maturity, carrying value |  | 1,505 | 2,342
Securities held-to-maturity, fair value |  | 1,557 | 2,464
Other loans held for sale, carrying value |  | 0 | 0
Other loans held for sale, fair value |  | 0 | 0
Loans and leases |  | 645 | 758
Loans and leases, fair value |  | 645 | 758
Other investment securities, at cost, carrying value |  | 609 | 596
Other investment securities, at cost, estimated fair value |  | 609 | 596
Financial liabilities: |  |  |
Deposits, carrying value |  | 154,361 | 147,164
Deposits, fair value |  | 154,366 | 147,223
Short-term borrowed funds |  | 74 | 243
Short-term borrowed funds, fair value |  | 74 | 243
Long-term borrowed funds, carrying value |  | 6,932 | 8,346
Long-term borrowed funds, fair value |  | 7,188 | 8,850
Level 3 |  |  |
Financial assets: |  |  |
Securities held to maturity, carrying value |  | 737 | 893
Securities held-to-maturity, fair value |  | 732 | 893
Other loans held for sale, carrying value |  | 735 | 439
Other loans held for sale, fair value |  | 735 | 439
Loans and leases |  | 127,518 | 122,332
Loans and leases, fair value |  | 127,511 | 122,920
Other investment securities, at cost, carrying value |  | 15 | 8
Other investment securities, at cost, estimated fair value |  | 15 | 8
Financial liabilities: |  |  |
Deposits, carrying value |  | 0 | 0
Deposits, fair value |  | 0 | 0
Short-term borrowed funds |  | 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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