Accounts Receivable (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts billed or billable	$ 110		$ 113
Unbilled amounts	1,425		1,500
Subtotal	2,865		2,929
Accounts Receivable, Net	2,652		2,929
Billable contracts receivable to be invoiced in the subsequent month	997		1,054
Deferred Proceeds Receivable From Sales Of Accounts Receivable	73		121
Accounts receivable sold, derecognized and uncollected at balance sheet date	580		723
Accounts receivable sales	2,906		3,401		3,699
Deferred proceeds	387		486		639
Loss on sale of accounts receivable	15		17		21
Estimated decrease to operating cash flows	(68)	[1]	(55)	[1]	(78)	[1]
Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amounts billed or billable	2,634		2,651
Unbilled amounts	319		390
Allowance for doubtful accounts	(88)		(112)
Discontinued operations	(213)	[2]	0	[2]
ITO [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Billable contracts receivable to be invoiced in the subsequent month	$ 52

[1] Represents the difference between current and prior year fourth quarter receivable sales adjusted for the effects of: (i) the deferred proceeds, (ii) collections prior to the end of the year and (iii) currency.

[2] (1)Represents net accounts receivable related to our ITO business which is held for sale and being reported as a discontinued operation at December 31, 2014. Refer to Note 4 - Divestitures for additional information regarding this pending sale.