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Acquisition and Divestitures - Summary of Identifiable Assets Acquired, Liabilities Assumed and Preferred Stock Exchanged as of Acquisition (Details) - USD ($) $ in Millions | Apr. 01, 2022 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Liabilities and preferred stock: |  |  |
Total liabilities and shareholders’ equity |  | $ 208,105 | $ 208,264
Goodwill |  | $ 8,465 | $ 8,465
Peoples United Financial Inc |  |  |
Business Acquisition [Line Items] |  |  |
Number of shares issued (in shares) | 50,325,004 |  |
Consideration: |  |  |
Common stock issued (50,325,004 shares) | $ 8,286 |  |
Common stock awards converted | 105 |  |
Cash | 2 |  |
Total consideration | 8,393 |  |
Identifiable assets: |  |  |
Cash and due from banks | 396 |  |
Interest-bearing deposits at banks | 9,193 |  |
Investment securities | 11,575 |  |
Loans and leases | 35,841 |  |
Core deposit and other intangible assets | 261 |  |
Other assets | 2,979 |  |
Total identifiable assets acquired | 60,245 |  |
Liabilities and preferred stock: |  |  |
Deposits | 52,968 |  |
Borrowings | 1,389 |  |
Other liabilities | 1,142 |  |
Total liabilities assumed | 55,499 |  |
Preferred stock | 261 |  |
Total liabilities and shareholders’ equity | 55,760 |  |
Net assets acquired | 4,485 |  |
Goodwill | $ 3,908 |  |

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