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Business Combination - Additional Information (Details) $ / shares in Units, $ in Millions |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 01, 2026 USD ($) banking_center_location $ / shares shares | Jan. 30, 2026 $ / shares | Jun. 30, 2026 USD ($) $ / shares | Dec. 31, 2025 USD ($) $ / shares
Business Combination [Line Items] |  |  |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares |  |  | $ 25,000 | $ 25,000
Goodwill acquired | $ |  |  | $ 5,043 | $ 29
Comerica Incorporated |  |  |  |
Business Combination [Line Items] |  |  |  |
Fair value of stock issued | $ | $ 12,700 |  |  |
Full-service banking centers | banking_center_location | 351 |  |  |
Shares issued in business combination (in shares) | shares | 240,000,000 |  |  |
Price per common share (in dollars per share) | $ / shares | $ 93.73 |  |  |
Closing price of stock | $ / shares |  | $ 50.22 |  |
Goodwill acquired | $ | $ 5,000 |  |  |
Comerica Incorporated | Common Stock |  |  |  |
Business Combination [Line Items] |  |  |  |
Fair value of stock issued | $ | $ 12,056 |  |  |
Shares issued per acquiree share (in shares) | shares | 1.8663 |  |  |
Comerica Incorporated | Depository Shares |  |  |  |
Business Combination [Line Items] |  |  |  |
Shares issued in business combination (in shares) | shares | 16,000,000 |  |  |
Comerica Incorporated | Fair value of preferred stock issued |  |  |  |
Business Combination [Line Items] |  |  |  |
Fair value of stock issued | $ | $ 412 |  |  |
Preferred stock, issued (in shares) | shares | 400,000 |  |  |
Preferred stock, liquidation preference per share (in dollars per share) | $ / shares | $ 1,000 |  |  |
Preferred stock, dividend rate | 6.875% |  |  |
Comerica Incorporated | Fixed Rate Reset Non-Cumulative Perpetual Stock, Series B | Comerica Incorporated |  |  |  |
Business Combination [Line Items] |  |  |  |
Preferred stock, dividend rate |  | 6.875% |  |
Comerica Incorporated | Series M Preferred Stock |  |  |  |
Business Combination [Line Items] |  |  |  |
Shares issued per acquiree share (in shares) | shares | 1 |  |  |

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