Restructuring Programs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Restructuring reserve [Roll Forward]
Balance at beginning of period	$ 123
Restructuring provision	24
Reversals of prior accruals	(7)
Net current period charges	17	[1]	(15)
Charges against reserve and currency	(39)		(53)
Balance at end of period	101
Reconciliation to the Condensed Consolidated Statements of Cash Flows [Abstract]
Asset impairment	2		0
Effects of foreign currency and other non-cash items	(2)		(4)
Cash Payments for Restructurings	(39)		(57)
Restructuring and Related Cost, Number of Positions Eliminated	500
Restructuring Charges Expected in Future Period, Minimum	20
Restructuring Charges Expected in Future Period, Maximum	40
Services Segment [Member]
Restructuring reserve [Roll Forward]
Net current period charges	3		(1)
Technology [Member]
Restructuring reserve [Roll Forward]
Net current period charges	17		(12)
Other [Member]
Restructuring reserve [Roll Forward]
Net current period charges	(3)		(2)
Severance and Related Costs [Member]
Restructuring reserve [Roll Forward]
Balance at beginning of period	116
Restructuring provision	22
Reversals of prior accruals	(7)
Net current period charges	15	[1]
Charges against reserve and currency	(37)
Balance at end of period	94
Lease Cancellation and Other Costs [Member]
Restructuring reserve [Roll Forward]
Balance at beginning of period	7
Restructuring provision	0
Reversals of prior accruals	0
Net current period charges	0	[1]
Charges against reserve and currency	0
Balance at end of period	7
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]

[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.