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ACQUISITIONS - Schedule of Pro Forma Information (Details) - Investors Acquisition - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Business Acquisition [Line Items] |  |  |  |  |
Net income | $ 658 |  | $ 609 | $ 1,741 | $ 1,754
Share-based compensation |  | $ 122 |  |  |
Net interest income |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net income | 1,665 |  | 1,352 | 4,531 | 4,004
Noninterest income |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net income | $ 512 |  | $ 530 | $ 1,550 | $ 1,559

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