Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities
Net income	$ 367us-gaap_NetIncomeLoss	$ 377us-gaap_NetIncomeLoss	$ 419us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	169us-gaap_DepreciationAndAmortization	147us-gaap_DepreciationAndAmortization	126us-gaap_DepreciationAndAmortization
Stock-based compensation expense	50us-gaap_ShareBasedCompensation	49us-gaap_ShareBasedCompensation	43us-gaap_ShareBasedCompensation
Excess tax benefit from stock-based compensation	(2)	(7)	(37)
Deferred income taxes	(2)us-gaap_DeferredIncomeTaxExpenseBenefit	18us-gaap_DeferredIncomeTaxExpenseBenefit	77us-gaap_DeferredIncomeTaxExpenseBenefit
Loss on investments	9us-gaap_GainLossOnInvestments	25us-gaap_GainLossOnInvestments	0us-gaap_GainLossOnInvestments
Changes in assets and liabilities:
Receivables	101us-gaap_IncreaseDecreaseInReceivables	(46)us-gaap_IncreaseDecreaseInReceivables	(165)us-gaap_IncreaseDecreaseInReceivables
Inventories	18us-gaap_IncreaseDecreaseInInventories	(9)us-gaap_IncreaseDecreaseInInventories	14us-gaap_IncreaseDecreaseInInventories
Current payables and accrued expenses	(23)	(63)	105
Deferred revenue	(28)	9	42
Other assets and liabilities	21	10	(49)
Net cash provided by operating activities	680	510	575
Investing activities
Expenditures for property and equipment	(54)	(60)	(67)
Additions to capitalized software	(75)tdc_AdditionsToCapitalizedSoftware	(78)tdc_AdditionsToCapitalizedSoftware	(81)tdc_AdditionsToCapitalizedSoftware
Business acquisitions and other investing activities, net	(69)	(36)	(274)
Net cash used in investing activities	(198)	(174)	(422)
Financing activities
Proceeds from short-term borrowings	220us-gaap_ProceedsFromShortTermDebt	0us-gaap_ProceedsFromShortTermDebt	0us-gaap_ProceedsFromShortTermDebt
Repayments of long-term borrowings	(26)us-gaap_RepaymentsOfLongTermDebt	(15)us-gaap_RepaymentsOfLongTermDebt	(11)us-gaap_RepaymentsOfLongTermDebt
Repurchases of common stock	(551)	(382)	(277)
Excess tax benefit from stock-based compensation	2	7	37
Other financing activities, net	29	28	55
Net cash used in financing activities	(326)	(362)	(196)
Effect of exchange rate changes on cash and cash equivalents	(17)	(8)	0
Increase (decrease) in cash and cash equivalents	139	(34)	(43)
Cash and cash equivalents at beginning of year	695	729	772
Cash and cash equivalents at end of year	834	695	729
Cash paid during the year for:
Income taxes	133us-gaap_IncomeTaxesPaid	124us-gaap_IncomeTaxesPaid	54us-gaap_IncomeTaxesPaid
Interest	$ 3us-gaap_InterestPaid	$ 4us-gaap_InterestPaid	$ 4us-gaap_InterestPaid

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Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration