The Company and its Subsidiaries	12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]
The Company and its Subsidiaries	Note 1: The Company and its Subsidiaries WMIH Corp. WMIH Corp. (“WMIH”) is a holding company organized and existing under the laws of the State of Delaware. On May 11, 2015, WMIH merged with its parent corporation, WMI Holdings Corp., a Washington corporation (“WMIHC”), with WMIH as the surviving corporation in the merger (the “Merger”). The Merger occurred as part of the reincorporation of WMIHC from the State of Washington to the State of Delaware effective May 11, 2015 (the “Reincorporation Date”). WMIH, formerly known as WMIHC and Washington Mutual, Inc. (“WMI”), is the direct parent of WM Mortgage Reinsurance Company, Inc., a Hawaii corporation (“WMMRC”), and WMI Investment Corp., a Delaware corporation (“WMIIC”). Our business activities consist of operating WMMRC’s legacy reinsurance business in runoff mode. We are actively seeking acquisition opportunities across a broad array of industries with a specific focus in 2015 in the financial services industry, including targets with consumer finance, specialty finance, leasing and insurance operations. As of December 31, 2015, WMIH was authorized to issue up to 3,500,000,000 shares of common stock, and up to 10,000,000 shares of preferred stock (in one or more series), in each case with a par value of $0.00001 per share. As of December 31, 2015 and December 31, 2014, 206,168,035 and 202,343,245 shares, respectively, of WMIH’s common stock were issued and outstanding. As of December 31, 2015 and December 31, 2014, 1,000,000 shares of WMIH’s Series A Convertible Preferred Stock (the “Series A Preferred Stock”) were issued and outstanding. As of December 31, 2015 and December 31, 2014, 600,000 and zero shares, respectively, of WMIH’s Series B Redeemable Convertible Preferred Stock (the “Series B Preferred Stock”) were issued and outstanding. WMMRC WMMRC is a wholly-owned subsidiary of WMIH. Prior to August 2008 (at which time WMMRC became a direct subsidiary of WMI), WMMRC was a wholly-owned subsidiary of FA Out-of-State Holdings, Inc., a second-tier subsidiary of Washington Mutual Bank (“WMB”) and third-tier subsidiary of WMI. WMMRC is a pure captive insurance company domiciled in the State of Hawaii. WMMRC was incorporated on February 25, 2000, and received a Certificate of Authority, dated March 2, 2000, from the Insurance Commissioner of the State of Hawaii. WMMRC was originally organized to reinsure private mortgage insurance risk for seven primary mortgage insurers then offering private mortgage insurance on loans originated or purchased by former subsidiaries of WMI. The seven primary mortgage insurers are United Guaranty Residential Insurance Company (“UGRIC”), Genworth Mortgage Insurance Corporation (“GMIC”), Mortgage Guaranty Insurance Corporation (“MGIC”), PMI Mortgage Insurance Company (“PMI”), Radian Guaranty Incorporated (“Radian”), Republic Mortgage Insurance Company (“RMIC”) and Triad Guaranty Insurance Company (“Triad”). Due to the then deteriorating performance in the mortgage guarantee markets and the closure and receivership of WMB, the reinsurance agreements with each of the primary mortgage insurers were terminated or placed into runoff during 2008. The agreements with UGRIC and Triad were placed into runoff effective May 31, 2008. The agreements with all other primary mortgage insurers were placed into runoff effective September 26, 2008. As a result, effective September 26, 2008, WMMRC’s continuing operations consisted solely of the runoff of coverage associated with mortgages placed with the primary mortgage carriers prior to September 26, 2008. In runoff, an insurer generally writes no new business but continues to service its obligations under in force policies and otherwise continues as a licensed insurer. Management does not believe any additional adjustments to the carrying values of assets and liabilities which were recorded at fair market value as a result of fresh start accounting as of March 19, 2012 are required as a result of WMMRC’s runoff status. The reinsurance agreements with Triad, PMI, and UGRIC were commuted on August 31, 2009, October 2, 2012 and April 3, 2014, respectively. As a result, WMMRC’s continuing operations consist solely of the runoff of coverage associated with mortgages placed with 4 remaining carriers, GMIC, MGIC, Radian and RMIC. WMIIC WMIIC does not currently have any operations and is fully eliminated upon consolidation.

Note 1: The Company and its Subsidiaries

WMIH Corp.

WMIH Corp. (“WMIH”) is a holding company organized and existing under the laws of the State of Delaware. On May 11, 2015, WMIH merged with its parent corporation, WMI Holdings Corp., a Washington corporation (“WMIHC”), with WMIH as the surviving corporation in the merger (the “Merger”). The Merger occurred as part of the reincorporation of WMIHC from the State of Washington to the State of Delaware effective May 11, 2015 (the “Reincorporation Date”).

WMIH, formerly known as WMIHC and Washington Mutual, Inc. (“WMI”), is the direct parent of WM Mortgage Reinsurance Company, Inc., a Hawaii corporation (“WMMRC”), and WMI Investment Corp., a Delaware corporation (“WMIIC”). Our business activities consist of operating WMMRC’s legacy reinsurance business in runoff mode. We are actively seeking acquisition opportunities across a broad array of industries with a specific focus in 2015 in the financial services industry, including targets with consumer finance, specialty finance, leasing and insurance operations.

As of December 31, 2015, WMIH was authorized to issue up to 3,500,000,000 shares of common stock, and up to 10,000,000 shares of preferred stock (in one or more series), in each case with a par value of $0.00001 per share. As of December 31, 2015 and December 31, 2014, 206,168,035 and 202,343,245 shares, respectively, of WMIH’s common stock were issued and outstanding. As of December 31, 2015 and December 31, 2014, 1,000,000 shares of WMIH’s Series A Convertible Preferred Stock (the “Series A Preferred Stock”) were issued and outstanding. As of December 31, 2015 and December 31, 2014, 600,000 and zero shares, respectively, of WMIH’s Series B Redeemable Convertible Preferred Stock (the “Series B Preferred Stock”) were issued and outstanding.

WMMRC

WMMRC is a wholly-owned subsidiary of WMIH. Prior to August 2008 (at which time WMMRC became a direct subsidiary of WMI), WMMRC was a wholly-owned subsidiary of FA Out-of-State Holdings, Inc., a second-tier subsidiary of Washington Mutual Bank (“WMB”) and third-tier subsidiary of WMI. WMMRC is a pure captive insurance company domiciled in the State of Hawaii. WMMRC was incorporated on February 25, 2000, and received a Certificate of Authority, dated March 2, 2000, from the Insurance Commissioner of the State of Hawaii.

WMMRC was originally organized to reinsure private mortgage insurance risk for seven primary mortgage insurers then offering private mortgage insurance on loans originated or purchased by former subsidiaries of WMI. The seven primary mortgage insurers are United Guaranty Residential Insurance Company (“UGRIC”), Genworth Mortgage Insurance Corporation (“GMIC”), Mortgage Guaranty Insurance Corporation (“MGIC”), PMI Mortgage Insurance Company (“PMI”), Radian Guaranty Incorporated (“Radian”), Republic Mortgage Insurance Company (“RMIC”) and Triad Guaranty Insurance Company (“Triad”).

Due to the then deteriorating performance in the mortgage guarantee markets and the closure and receivership of WMB, the reinsurance agreements with each of the primary mortgage insurers were terminated or placed into runoff during 2008. The agreements with UGRIC and Triad were placed into runoff effective May 31, 2008. The agreements with all other primary mortgage insurers were placed into runoff effective September 26, 2008. As a result, effective September 26, 2008, WMMRC’s continuing operations consisted solely of the runoff of coverage associated with mortgages placed with the primary mortgage carriers prior to September 26, 2008. In runoff, an insurer generally writes no new business but continues to service its obligations under in force policies and otherwise continues as a licensed insurer. Management does not believe any additional adjustments to the carrying values of assets and liabilities which were recorded at fair market value as a result of fresh start accounting as of March 19, 2012 are required as a result of WMMRC’s runoff status. The reinsurance agreements with Triad, PMI, and UGRIC were commuted on August 31, 2009, October 2, 2012 and April 3, 2014, respectively. As a result, WMMRC’s continuing operations consist solely of the runoff of coverage associated with mortgages placed with 4 remaining carriers, GMIC, MGIC, Radian and RMIC.

WMIIC

WMIIC does not currently have any operations and is fully eliminated upon consolidation.