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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments not Recorded at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Asset-backed investments included in HTM securities | [1] | $ 10,071 | $ 2,242
Debt Securities held-to-maturity, fair value |  | 9,373 | 2,289
Other loans held for sale, carrying value |  | 914 | 735
Other loans held for sale, fair value |  | 909 | 735
Loans and leases, carrying value |  | 156,140 | 128,163
Loans and leases, fair value |  | 150,566 | 128,156
Other assets, carrying value |  | 1,113 | 624
Other assets, fair value |  | 1,113 | 624
Deposits, carrying value |  | 178,566 | 154,361
Deposits, fair value |  | 178,417 | 154,366
Short-term borrowed funds, carrying value |  | 263 | 74
Short-term borrowed funds, fair value |  | 263 | 74
Long-term borrowed funds, carrying value |  | 16,286 | 6,932
Long-term borrowed funds, fair value |  | 15,786 | 7,188
Level 1 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Asset-backed investments included in HTM securities |  | 0 | 0
Debt 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, carrying value |  | 0 | 0
Loans and leases, fair value |  | 0 | 0
Other assets, carrying value |  | 0 | 0
Other assets, 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] |  |  |
Asset-backed investments included in HTM securities |  | 9,457 | 1,505
Debt Securities held-to-maturity, fair value |  | 8,804 | 1,557
Other loans held for sale, carrying value |  | 0 | 0
Other loans held for sale, fair value |  | 0 | 0
Loans and leases, carrying value |  | 555 | 645
Loans and leases, fair value |  | 555 | 645
Other assets, carrying value |  | 1,098 | 609
Other assets, fair value |  | 1,098 | 609
Deposits, carrying value |  | 178,566 | 154,361
Deposits, fair value |  | 178,417 | 154,366
Short-term borrowed funds, carrying value |  | 263 | 74
Short-term borrowed funds, fair value |  | 263 | 74
Long-term borrowed funds, carrying value |  | 16,286 | 6,932
Long-term borrowed funds, fair value |  | 15,786 | 7,188
Level 3 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Asset-backed investments included in HTM securities |  | 614 | 737
Debt Securities held-to-maturity, fair value |  | 569 | 732
Other loans held for sale, carrying value |  | 914 | 735
Other loans held for sale, fair value |  | 909 | 735
Loans and leases, carrying value |  | 155,585 | 127,518
Loans and leases, fair value |  | 150,011 | 127,511
Other assets, carrying value |  | 15 | 15
Other assets, fair value |  | 15 | 15
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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