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BASIS OF PRESENTATION - Narrative (Details) - USD ($) $ in Millions |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 | Mar. 01, 2019 | Jan. 01, 2019 | Dec. 31, 2023 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 02, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 7,044 |  | $ 6,923 | $ 6,887
Cumulative effect of change in accounting standards |  |  | $ 5 |  |  |  | $ 17 |  |
Right-of-use asset |  |  |  |  |  | 699 |  |  |
Lease liability |  |  |  |  |  | 721 |  |  |
Allowance for credit losses |  |  |  |  |  | $ 1,296 |  | $ 1,333 |
Clarfeld |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Consideration transferred |  |  | 110 |  |  |  |  |  |
Goodwill |  |  | 83 |  |  |  |  |  |
Intangible assets acquired |  |  | 21 |  |  |  |  |  |
Bowstring |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Consideration transferred |  | $ 40 |  |  |  |  |  |  |
Goodwill |  | 35 |  |  |  |  |  |  |
Intangible assets acquired |  | $ 6 |  |  |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Right-of-use asset |  |  | 734 |  |  |  |  |  |
Lease liability |  |  | 749 |  |  |  |  |  |
Forecast | Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Basis point change in CET1 |  |  |  | (0.24%) | (0.06%) |  |  |  |
Retained Earnings |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting standards |  |  |  |  |  |  | $ 12 |  |
Retained Earnings | Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cumulative effect of change in accounting standards |  |  | $ 12 |  |  |  |  |  |
Subsequent Event | Forecast | Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Allowance for credit losses | $ 450 |  |  |  |  |  |  |  |
Capital impact phase in percentage | 25.00% |  |  |  |  |  |  |  |

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