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Business Combinations and Asset Acquisitions (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Oct. 31, 2024 USD ($)
Business Acquisition [Line Items] |  |  |
Business combination, share exchange ratio | 11.0 |  |
Flagstar Bank, N.A. |  |  |
Business Acquisition [Line Items] |  |  |
Asset Acquisition, Consideration Transferred |  | $ 1,300 |
Flagstar Bank, N.A. | Mortgage servicing rights |  |  |
Business Acquisition [Line Items] |  |  |
Asset Acquisition, Assets Acquired, Amount |  |  | $ 1,200
Flagstar Bank, N.A. | Customer-Related Intangible Assets |  |  |
Business Acquisition [Line Items] |  |  |
Asset Acquisition, Assets Acquired, Amount |  |  | $ 101
Rocket Companies, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Price of Acquisition, Expected | $ 9,400 |  |

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