INVESTMENT SECURITIES AND OTHER SECURITIES - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2022 |
Mar. 31, 2021 |
Dec. 31, 2021 |
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| Investments, Debt and Equity Securities [Abstract] | |||
| Transfer of securities from available-for-sale to held-to-maturity | $ 4,225 | $ 0 | |
| Unrealized gains attributed to transfer of securities | (58) | ||
| Pledged investment securities | 30,300 | $ 21,700 | |
| Impairment loss, AFS debt security | $ 4 | ||
| X | ||||||||||
- Definition Available For Sale Securities Transferred To Held To Maturity Securities. No definition available.
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| X | ||||||||||
- Definition Unrealized Net Losses Recognized In OCI At Time Of Transfer Of Available For Sale Securities Transferred To Held To Maturity Securities No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of other-than-temporary impairment (OTTI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), recognized in earnings and other comprehensive loss (OCI). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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