Divestitures (Details) $ in Millions			3 Months Ended				9 Months Ended
		Jun. 30, 2015 USD ($) country Employees	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)		Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of businesses			$ 6			$ 1	$ 939	$ 16
Revenues			0			331	619	1,038
Income (loss) from operations	[1],[2]		0			14	104	57
Loss on disposal			(5)			(1)	(77)	(1)
Net (loss) income before income taxes			(5)			13	27	56
Income tax benefit (expense)			2			(5)	(91)	(22)
(Loss) income from discontinued operations, net of tax			(3)			8	(64)	34
Disposal Group, Including Discontinued Operation, Assets [Abstract]
Total Assets of Discontinued Operations			0	$ 1,260	[3]		0
ITO
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							52
Revenues			0			325	619	993
Income (loss) from operations	[1],[2]		0			15	104	58
Loss on disposal			(5)	(181)		0	(77)	0
Net (loss) income before income taxes			(5)			15	27	58
Income tax benefit (expense)			2			(6)	(91)	(21)
(Loss) income from discontinued operations, net of tax			(3)			9	(64)	37
Disposal Group, Including Discontinued Operation, Depreciation and Amortization						41	80	121
Disposal group, amortization of acquired intangible assets						7	14	21
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			6	0	45
Income (loss) from operations	[1],[2]		0			(1)	0	(1)
Loss on disposal			0			(1)	0	(1)
Net (loss) income before income taxes			0			(2)	0	(2)
Income tax benefit (expense)			0			1	0	(1)
(Loss) income from discontinued operations, net of tax			$ 0			$ (1)	$ 0	$ (3)

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

[2] (2)ITO Income from operations for the three and nine months ended September 30, 2014, includes approximately $41 and $121, respectively, of depreciation and amortization expense (including intangible amortization of approximately $7 and $21, respectively).

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