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Business Combinations - Pro Forma Information (Details) - Flagstar Bancorp - USD ($) $ in Millions	12 Months Ended
	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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Business Acquisitions, Pro Forma Net Income Available To Common Stockholders

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
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