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Business Combination - Summary of Unaudited Pro Forma Financial Information (Details) - Flagstar - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Business Acquisition [Line Items] |  |
Net interest income | $ 2,278 | $ 2,208
Non-interest income | 650 | 1,105
Net income | 804 | 1,207
Net income available to common stockholders | $ 771 | $ 1,174

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