Divestitures (Details) $ in Millions			3 Months Ended						6 Months Ended
		Jun. 30, 2015 USD ($) country Employees	Jun. 30, 2015 USD ($)		Dec. 31, 2014 USD ($)		Jun. 30, 2014 USD ($)		Jun. 30, 2015 USD ($)		Jun. 30, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of businesses			$ 930				$ 15		$ 933		$ 15
Revenues			308				358		619		707
Income (loss) from operations (1), (2)	[1],[2]		43				23		104		43
Loss on disposal			(68)				(2)		(72)		0
Net (loss) income before income taxes			(25)				21		32		43
Income tax expense			(70)				(10)		(93)		(17)
(Loss) income from discontinued operations, net of tax			(95)				11		(61)		26
Disposal Group, Including Discontinued Operation, Assets [Abstract]
Total Assets of Discontinued Operations		$ 0	0		$ 1,260	[3]			0
ITO [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of businesses		940
Proceeds from Divestiture of Businesses, Net of Cash Divested		930
Discontinued Operations - Liabilities assumed by Acquirer		85
Proceeds from Divestiture of Business, net of tax		$ 850
Employees Transferred in Business Sale or Divestiture | Employees		9,600
Number of Countries, a Business or Segment has operations in | country		42
Discontinued Operations, Additional Tax Expense			54
Revenues			308				341		619		669
Income (loss) from operations (1), (2)	[1]		43	[2]			23	[2]	104	[2]	44
Loss on disposal			(68)		(181)		0		(72)		0
Net (loss) income before income taxes			(25)				23		32		44
Income tax expense			(70)				(9)		(93)		(16)
(Loss) income from discontinued operations, net of tax			(95)				14		(61)		28
Disposal Group, Including Discontinued Operation, Depreciation and Amortization			41				8		80		16
Disposal group, amortization of acquired intangible assets			7						14
Disposal Group, Including Discontinued Operation, Assets [Abstract]
Accounts receivable, net					213
Other current assets					146
Land, buildings and equipment, net					220
Intangible assets, net					197
Goodwill					337
Other long-term assets					147
Total Assets of Discontinued Operations					1,260
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]
Current portion of long-term debt					31
Accounts payable					32
Accrued pension and benefit costs					9
Unearned income					64
Other current liabilities					112
Long-term debt					44
Pension and other benefit liabilities					25
Other long-term liabilities					54
Total Liabilities of Discontinued Operations					$ 371
Other Segment [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues			0				17		0		38
Income (loss) from operations (1), (2)	[1],[2]		0				0		0		(1)
Loss on disposal			0				(2)		0		0
Net (loss) income before income taxes			0				(2)		0		(1)
Income tax expense			0				(1)		0		(1)
(Loss) income from discontinued operations, net of tax			$ 0				$ (3)		$ 0		$ (2)

[1] (1)ITO Income from operations excludes depreciation and amortization expenses of approximately $41 and $80 (including $7 and $14 for intangible amortization) for the three and six months ended June 30, 2015, respectively, since the business was held for sale.

[2] (2)ITO Income from operations includes intangible amortization and other expenses of approximately $8 and $16 for the three and six months ended June 30, 2014, respectively.

[3] Certain prior year amounts have been revised - Refer to Note 1 - Basis of Presentation for additional information.