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Discontinued Operations - Reconciliation of Net Earnings of Discontinued Operations to Statement of Operations(Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net earnings from discontinued operations $ 0 $ 21 $ 155 $ 70 $ 60
Black Knight Financial Services, Inc. | Discontinued Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net earnings from discontinued operations   22 59 74 57
FNFV | Discontinued Operations          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net earnings from discontinued operations   $ (1) $ 96 $ (4) $ 3