Employee Benefit Plans Changes in Benefit Obligations Plan Assets Funded Status and Reconciliation of Funded Status to Amounts Recognized in Consolidated Balance Sheets and in Accumulated Other Comprehensive Income (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in Postemployment Benefit Obligation
Benefit obligation at January 1	$ 27	$ 25
Service cost	4tdc_PostemploymentPlanServiceCost	3tdc_PostemploymentPlanServiceCost	4tdc_PostemploymentPlanServiceCost
Interest cost	1tdc_PostemploymentBenefitInterestCost	1tdc_PostemploymentBenefitInterestCost	1tdc_PostemploymentBenefitInterestCost
Actuarial loss	19	3
Benefits paid	(11)	(4)
Currency translation adjustments	(1)	(1)
Benefit obligation at December 31	39	27	25
Postemployment Benefits, Funded Status (Underfunded)	(39)	(27)
Change in Pension Benefit Plan Assets
Fair value of plan assets at January 1	76
Fair value of plan assets at December 31	67	76
Amounts Recognized in the Balance Sheet, Postemployment
Current liabilities	(5)	(4)
Non-current liabilities	(34)	(23)
Non-current liabilities	(39)	(27)	(25)
Amounts Recognized in Accumulated Other Comprehensive Income, Postemployment
Unrecognized Net actuarial loss (gain)	6	(12)
Unrecognized Prior service (credit) cost	1	0
Total	7	(12)
Foreign Pension Plan
Change in Pension Benefit Obligation
Benefit obligation at January 1	129	122
Service cost	9	8
Interest cost	4	4
Plan participant contributions	1	1
Actuarial loss	18	6
Benefits paid	(19)	(6)
Currency translation adjustments	(15)	(6)
New plans	3	0
Benefit obligation at December 31	130	129
Change in Pension Benefit Plan Assets
Fair value of plan assets at January 1	76	69
Actual return on plan assets	7	9
Company contributions	8	10
Benefits paid	(19)	(6)
Currency translation adjustments	(7)	(7)
Plan participant contribution	1	1
New plans	1	0
Fair value of plan assets at December 31	67	76
Funded status (underfunded)	(63)	(53)
Amounts Recognized in Balance Sheet, Pension
Non-current assets	4	1
Current liabilities	(1)	(1)
Non-current liabilities	(66)	(53)
Net amounts recognized	(63)	(53)
Amounts Recognized in Accumulated Other Comprehensive Income, Pension
Unrecognized Net actuarial loss (gain)	33	26
Unrecognized Prior service (credit) cost	0	(2)
Total	$ 33	$ 24

Defined Benefit Plan, New Plan, Plan Assets

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Defined Benefit Plan, New Plans

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Postemployment Benefit, Accumulated Other Comprehensive Income (Loss), before Tax, Total

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Postemployment Benefit, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax

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Postemployment Benefit, Accumulated Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax

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Postemployment Benefit, Actuarial Loss (Gain)

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Postemployment Benefit, Currency Translation Adjustment

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Postemployment Benefit, Interest Cost

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Postemployment Benefits, Funded Status (Underfunded)

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Postemployment Plan, Service Cost

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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The increase in the fair value of plan assets from contributions made by the employer.

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The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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Amount of gain (loss) from foreign currency exchange rate changes for benefit obligation for plans of a foreign operation whose functional currency is not the reporting currency.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans.

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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For a classified balance sheet, the carrying amount as of the balance sheet date of the portion of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement that is payable within one year of the balance sheet date.

+ References

+ Details

Name:	us-gaap_PostemploymentBenefitsLiabilityCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying amount as of the balance sheet date of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement.

+ References

+ Details

Name:	us-gaap_PostemploymentBenefitsLiabilityCurrentAndNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 712

-SubTopic 10

-Section 25

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6410138&loc=d3e79691-111665

+ Details

Name:	us-gaap_PostemploymentBenefitsLiabilityNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period expense related to postemployment benefits.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_ForeignPensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: