Divestitures (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Mar. 04, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Separation costs		$ 0		$ 28	$ 8	$ 36
Total Costs and Expenses		2,374		2,602	4,844	5,185
Loss from discontinued operations, net of tax		0		(38)	(6)	(73)
Interest expense	[1]	57		74	126	161
Proceeds from Conduent		0		0	161	0
Conduent [Domain]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues		0		1,597	0	3,268
Cost of services		0		1,343	0	2,752
Other expenses(1)	[2]	0		300	8	611
Total Costs and Expenses		0		1,643	8	3,363
Net loss before income taxes		0		(46)	(8)	(95)
Income tax benefit		0		8	2	22
Loss from discontinued operations, net of tax		$ 0		(38)	$ (6)	(73)
Interest expense				$ 6		$ 7
Proceeds from Conduent			$ 161
Conduent Cash Balance at Separation							$ 225
Senior Debt Obligations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Unsecured Debt								$ 1,000

[1] Includes Cost of financing as well as non-financing interest expense that is included in Other expenses, net in the Condensed Consolidated Statements of Income.

[2] The three and six months ended June 30, 2016 include $6 and $7, respectively, of interest on the $1.0 billion Senior Unsecured Term Facility, which was required to be repaid upon completion of the Separation and therefore was reported in the Loss from discontinued operations.