Divestitures (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of tax	$ 0	$ 3	$ 0	$ (3)
Conduent [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Date			Dec. 31, 2016
Loss from operations		1		9
Loss on disposal		0		0
Net loss before income taxes		(1)		(9)
Income tax benefit		4		6
Income (loss) from discontinued operations, net of tax		$ 3		$ (3)

Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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