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Advances and Other Receivables, Net - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 7 Months Ended 9 Months Ended
Jul. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Jul. 31, 2018
Sep. 30, 2017
Aug. 01, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Cumulative incurred losses related to advances and other receivables associated with inactive and liquidated loans $ 4 $ 13 $ 15 $ 38 $ 53    
Receivables discount $ 56 56   $ 56      
Receivables From Prior Servicers, Forward Loan Portfolio              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Account receivables   $ 84         $ 134
WMIH Corp And Wand Merger Corporation              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Receivables discount           $ 302