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STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 23, 2024 | May 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, issued |  |  | $ 2,113 | $ 2,014 |
Preferred stock, issued (in shares) |  |  | 2,150,000 | 2,050,000 |
Preferred stock, par value (in dollars per share) |  |  | $ 25.00 | $ 25.00 |
Cost of stock repurchase |  |  | $ 1,050 | $ 906 | $ 153
Treasury stock purchased (in shares) |  |  | 28,113,278 | 28,473,805 |
Series H |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, issued | $ 400 |  | $ 392 | $ 0 |
Preferred stock, issued (in shares) | 400,000 |  | 400,000 | 0 |
Preferred stock, dividend rate | 7.375% | 9.205% |  |  |
Preferred stock, par value (in dollars per share) | $ 25.00 |  |  |  |
Preferred stock, liquidation preference (in dollars per share) | $ 1,000 |  | $ 1,000 |  |
Proceeds from issuance of preferred stock | $ 392 |  |  |  |
Redemption option regulatory capital treatment event window | 90 days |  |  |  |

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