Business Combinations and Asset Acquisitions (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Jul. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Aug. 01, 2023
Business Acquisition [Line Items]
Asset Acquisition, Consideration Transferred			$ 34
Business Combination, Description [Abstract]
Business Combination, Bargain Purchase, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]		Other expenses, net
Home Point Capital Inc [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		$ 658
Business Combination, Consideration Transferred for MSRs		335
Business Combination, Consideration Transferred for Tender Offer		$ 323
Price per share (in dollars per share)				$ 2.33
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Mortgage Servicing Rights				$ 1,200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Senior Note				$ 500
Business Combination, Description [Abstract]
Business Combination, Bargain Purchase, Gain Recognized, Description		The Company believes it was able to negotiate a bargain purchase price due to seller’s operational challenges from significant market volatility, as well as the seller’s desire to exit the business in an expedited manner.
Home Point Capital Inc [Member] | Corporate and other
Business Acquisition [Line Items]
Bargain purchase gain		$ 96
Roosevelt
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 28
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 4
Goodwill acquired		21
Roosevelt | Servicing
Business Acquisition [Line Items]
Goodwill acquired		5
Roosevelt | Corporate and other
Business Acquisition [Line Items]
Goodwill acquired		$ 16