Restructuring Programs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011	Sep. 30, 2012		Sep. 30, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring Charges Expected in Future Period, Minimum	$ 50			$ 50
Restructuring and Related Cost, Number of Positions Eliminated				2,000
Restructuring, Lease Termination and Asset Impairment Charges				7
Restructuring reserve [Roll Forward]
Balance at beginning of period				123
Restructuring provision				71
Reversals of prior accruals				(11)
Net current period charges	14		(4)	60	[1]	(28)
Charges against reserve and currency	29		49	114		169
Balance at end of period	69			69
Reconciliation to the Condensed Consolidated Statements of Cash Flows [Abstract]
Asset impairment	0		0	(2)		0
Effects of foreign currency and other non-cash items	(1)		7	(1)		7
Cash Payments for Restructurings	(30)		(42)	(113)		(162)
Restructuring Charges Expected in Future Period, Maximum	100			100
Services Segment [Member]
Restructuring reserve [Roll Forward]
Net current period charges	6		(2)	25		(2)
Technology [Member]
Restructuring reserve [Roll Forward]
Net current period charges	8		(4)	37		(23)
Other [Member]
Restructuring reserve [Roll Forward]
Net current period charges	0		2	(2)		(3)
Severance and Related Costs [Member]
Restructuring reserve [Roll Forward]
Balance at beginning of period				116
Restructuring provision				64
Reversals of prior accruals				(11)
Net current period charges				53	[1]
Charges against reserve and currency				108
Balance at end of period	61			61
Lease Cancellation and Other Costs [Member]
Restructuring reserve [Roll Forward]
Balance at beginning of period				7
Restructuring provision				5
Reversals of prior accruals				0
Net current period charges				5	[1]
Charges against reserve and currency				4
Balance at end of period	8			8
Asset Impairments [Member]
Restructuring reserve [Roll Forward]
Balance at beginning of period				0	[2]
Restructuring provision				2	[2]
Reversals of prior accruals				0	[2]
Net current period charges				2	[2]
Charges against reserve and currency				2	[2]
Balance at end of period	$ 0	[2]		$ 0	[2]

[1] (1)Represents net amount recognized within the Condensed Consolidated Statements of Income for the period shown.

[2] (2)Charges associated with asset impairments represent the write-down of the related assets to their new cost basis and are recorded concurrently with the recognition of the provision.