INVESTMENT SECURITIES AND OTHER SECURITIES - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2021 |
Sep. 30, 2021 |
Sep. 30, 2020 |
Dec. 31, 2020 |
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| Investments, Debt and Equity Securities [Abstract] | ||||
| Pledged Financial Instruments, Not Separately Reported, Securities for Other Debt Facilities | $ 23,200 | $ 14,400 | ||
| Transfer of securities from available-for-sale to held-to-maturity | $ 3,000 | $ 3,007 | $ 1,520 | |
| Unrealized Net Losses Recognized In OCI At Time Of Transfer Of Available For Sale Securities Transferred To Held To Maturity Securities | $ 2 | |||
| 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 The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for debt facilities other than FHLB loans, repurchase agreements and letter of credit arrangements, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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