Divestitures (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations, net of tax	$ 0	$ (6)
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	$ 0	8
Loss on disposal	0	0
Net loss before income taxes	0	(8)
Income tax benefit	0	2
Loss from discontinued operations, net of tax	$ 0	$ (6)