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Business Combinations - Pro Forma Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($)
Business Acquisition [Line Items] |
Business Combination Bargain Purchase Gain Recognized Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag | Interest Income (Expense), Operating
Flagstar Bancorp |
Business Acquisition [Line Items] |
Net interest income | $ 2,278
Non-interest income | 650
Net income | 804
Net income available to common stockholders | $ 771

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