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Acquisitions - Aggregate Purchase Price (Details) - Nationstar Mortgage Holdings Inc.
$ / shares in Units, shares in Millions, $ in Millions
Aug. 01, 2018
USD ($)
$ / shares
shares
Business Acquisition [Line Items]  
Converted WMIH common shares (in shares) | shares 394
Price per share (in dollars per share) | $ / shares $ 1.398
Purchase price from common stock issued $ 551
Purchase price from cash payment 1,226
Total purchase price $ 1,777