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Business Combinations and Discontinued Operations - Schedule of Operating Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | May 18, 2025
Business Combination [Line Items] |  |  |  |  |  |
Net interest income (loss) | $ 12,404 | $ 8,076 | $ 30,412 | $ 23,110 |  |
Total non-interest income (loss) | 2,955 | 1,938 | 7,439 | 5,812 |  |
Income (loss) from continuing operations, net of tax | 3,193 | 1,777 | 334 | 3,654 |  |
Discover |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |
Net interest income (loss) | 12,580,000 | 11,738,000 | 36,335,000 | 33,583,000 |  |
Total non-interest income (loss) | 2,955,000 | 2,564,000 | 8,397,000 | 7,827,000 |  |
Income (loss) from continuing operations, net of tax | 3,363,000 | 2,123,000 | 8,369,000 | (361,000) |  |
Business combination, pro forma net interest income |  | $ 244 |  | $ 764 |  |
Business combination, allowance for credit losses PCD loan | $ 8,800 |  | $ 8,800 |  | $ 8,800 | $ 8,800

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