Restructuring Programs (Details) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Employees		Sep. 30, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs		$ 32	$ 20	$ 229		$ 191
Restructuring and Related Cost, Expected Number of Positions Eliminated (approximately) | Employees				5,700
Three-Year Strategic Transformation Program - Professional Support Services				$ 30
Reversals				25
Restructuring Reserve [Roll Forward]
Balance at beginning of period				24
Provision				224
Reversals				(25)
Net Current Period Charges		13	20	199	[1]	191
Charges against reserve		(54)	(30)	(120)		(242)
Balance at end of period		103		103
Reconciliation To Consolidated Statements Of Cash Flows [Abstract]
Charges against reserve		(54)	(30)	(120)		(242)
Asset impairments		0	7	2		153
Effects of foreign currency and other non-cash items		(1)	3	(2)		8
Restructuring Cash Payments		(55)	(20)	(120)		(81)
Services [Member]
Restructuring Reserve [Roll Forward]
Net Current Period Charges		3	11	65		165	[2]
Technology Segment [Member]
Restructuring Reserve [Roll Forward]
Net Current Period Charges		10	1	138		18
Other [Member]
Restructuring Reserve [Roll Forward]
Net Current Period Charges		0	$ 8	(4)		8
Severance and Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Reversals				20
Restructuring Charges				218
Restructuring Reserve [Roll Forward]
Balance at beginning of period				22
Provision				218
Reversals				(20)
Net Current Period Charges	[1]			198
Charges against reserve				(118)
Balance at end of period		102		102
Reconciliation To Consolidated Statements Of Cash Flows [Abstract]
Charges against reserve				(118)
Lease Cancellation and Other Costs [Member]
Restructuring Cost and Reserve [Line Items]
Reversals				0
Restructuring Charges				4
Restructuring Reserve [Roll Forward]
Balance at beginning of period				2
Provision				4
Reversals				0
Net Current Period Charges	[1]			4
Charges against reserve				(5)
Balance at end of period		1		1
Reconciliation To Consolidated Statements Of Cash Flows [Abstract]
Charges against reserve				(5)
Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Reversals	[3]			5
Restructuring Reserve [Roll Forward]
Balance at beginning of period				0
Provision	[3]			2
Reversals	[3]			(5)
Net Current Period Charges	[1],[3]			(3)
Charges against reserve	[3]			3
Balance at end of period		$ 0		0
Reconciliation To Consolidated Statements Of Cash Flows [Abstract]
Charges against reserve	[3]			$ 3
Software Impairment Charge [Domain]
Reconciliation To Consolidated Statements Of Cash Flows [Abstract]
Asset impairments						$ 146

[1] Represents net amount recognized within the Condensed Consolidated Statements of Income for the period shown for restructuring and asset impairments charges.

[2] (1)The nine months ended September 30, 2015 includes $146 of software asset impairment charges.

[3] 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.