Real Estate Owned Loans, Government Guarantee

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Other Assets - Narrative (Details) - USD ($) $ in Millions	Aug. 01, 2018	Sep. 30, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
REO loans with government guarantee		$ 9	$ 15
Nationstar Mortgage Holdings Inc.
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Intangible assets	$ 103
Intangible assets acquired	103
Xome Holdings LLC \| Assurant Mortgage Solutions Group
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Intangible assets acquired	23
Goodwill acquired	$ 3