Pensions and Other Post-Retirement Benefits - Summary of Pension Plans (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in projected benefit obligation
Benefit obligation at beginning of period	$ 1,740	$ 1,686
Service cost	19us-gaap_DefinedBenefitPlanServiceCost	19us-gaap_DefinedBenefitPlanServiceCost	17us-gaap_DefinedBenefitPlanServiceCost
Interest cost	67us-gaap_DefinedBenefitPlanInterestCost	62us-gaap_DefinedBenefitPlanInterestCost	66us-gaap_DefinedBenefitPlanInterestCost
Plan participants’ contributions	2	2
Actuarial losses/(gains)	320	(23)
Benefits paid	(69)us-gaap_DefinedBenefitPlanBenefitsPaid	(67)us-gaap_DefinedBenefitPlanBenefitsPaid
Expenses paid	(5)nlsnnv_DefinedBenefitPlanExpensesPaid	(5)nlsnnv_DefinedBenefitPlanExpensesPaid
Premiums paid	(1)nlsnnv_DefinedBenefitPlanPremiumsPaid	(1)nlsnnv_DefinedBenefitPlanPremiumsPaid
Amendments	(4)	(1)
Curtailments	(1)us-gaap_DefinedBenefitPlanCurtailments	(13)us-gaap_DefinedBenefitPlanCurtailments
Settlements	(41)	(1)
Acquisition		47
Effect of foreign currency translation	(165)	35
Benefit obligation at end of period	1,862	1,740	1,686
Change in plan assets
Fair value of plan assets at beginning of period	1,588	1,441
Actual return on plan assets	202	99
Employer contributions	35	51
Plan participants’ contributions	2	2
Benefits paid	(69)us-gaap_DefinedBenefitPlanBenefitsPaid	(67)us-gaap_DefinedBenefitPlanBenefitsPaid
Expenses paid	(5)	(5)
Premiums paid	(1)	(1)
Settlements	(41)	(1)
Acquisition		36
Insurance	6
Effect of foreign currency translation	(143)	33
Fair value of plan assets at end of period	1,574	1,588	1,441
Funded status	(288)	(152)
Amounts recognized in the Consolidated Balance Sheets
Pension assets included in other non-current assets	35	40
Current liabilities	(3)	(2)
Accrued benefit liability included in other non-current liabilities	(320)	(190)
Net amount recognized	(288)	(152)
Amounts recognized in Accumulated Other Comprehensive Income/(Loss), before tax
Net loss	156	(46)
Settlement loss	(7)
Amortization of net loss	(12)	(17)	(11)
Total recognized in other comprehensive income/(loss)	137	(63)
Amounts not yet reflected in net periodic benefit cost and included in Accumulated Other Comprehensive Income/(Loss), before tax
Unrecognized losses	463	326
The Netherlands
Change in projected benefit obligation
Benefit obligation at beginning of period	761	727
Service cost	4	4	3
Interest cost	25	25	28
Actuarial losses/(gains)	137	12
Benefits paid	(35)	(35)
Expenses paid	(2)	(2)
Amendments	(4)
Effect of foreign currency translation	(102)	30
Benefit obligation at end of period	784	761	727
Change in plan assets
Fair value of plan assets at beginning of period	736	707
Actual return on plan assets	90	28
Employer contributions	11	8
Benefits paid	(35)	(35)
Expenses paid	(2)	(2)
Insurance	6
Effect of foreign currency translation	(95)	30
Fair value of plan assets at end of period	711	736	707
Funded status	(73)	(25)
Amounts recognized in the Consolidated Balance Sheets
Accrued benefit liability included in other non-current liabilities	(73)	(25)
Net amount recognized	(73)	(25)
Amounts recognized in Accumulated Other Comprehensive Income/(Loss), before tax
Net loss	45	24
Amortization of net loss	(5)	(6)	(3)
Total recognized in other comprehensive income/(loss)	40	18
Amounts not yet reflected in net periodic benefit cost and included in Accumulated Other Comprehensive Income/(Loss), before tax
Unrecognized losses	223	183
United States
Change in projected benefit obligation
Benefit obligation at beginning of period	336	295
Service cost	1
Interest cost	16	13	13
Actuarial losses/(gains)	52	(8)
Benefits paid	(12)	(11)
Curtailments	(1)
Settlements	(12)
Acquisition		47
Benefit obligation at end of period	380	336	295
Change in plan assets
Fair value of plan assets at beginning of period	298	248
Actual return on plan assets	26	25
Employer contributions	1
Benefits paid	(12)	(11)
Settlements	(12)
Acquisition		36
Fair value of plan assets at end of period	301	298	248
Funded status	(79)	(38)
Amounts recognized in the Consolidated Balance Sheets
Current liabilities	(1)	(1)
Accrued benefit liability included in other non-current liabilities	(78)	(37)
Net amount recognized	(79)	(38)
Amounts recognized in Accumulated Other Comprehensive Income/(Loss), before tax
Net loss	46	(14)
Settlement loss	(1)
Amortization of net loss	(4)	(5)	(4)
Total recognized in other comprehensive income/(loss)	41	(19)
Amounts not yet reflected in net periodic benefit cost and included in Accumulated Other Comprehensive Income/(Loss), before tax
Unrecognized losses	96	55
Other
Change in projected benefit obligation
Benefit obligation at beginning of period	643	664
Service cost	14	15	14
Interest cost	26	24	25
Plan participants’ contributions	2	2
Actuarial losses/(gains)	131	(27)
Benefits paid	(22)	(21)
Expenses paid	(3)	(3)
Premiums paid	(1)	(1)
Amendments		(1)
Curtailments		(13)
Settlements	(29)	(1)
Effect of foreign currency translation	(63)	5
Benefit obligation at end of period	698	643	664
Change in plan assets
Fair value of plan assets at beginning of period	554	486
Actual return on plan assets	86	46
Employer contributions	23	43
Plan participants’ contributions	2	2
Benefits paid	(22)	(21)
Expenses paid	(3)	(3)
Premiums paid	(1)	(1)
Settlements	(29)	(1)
Effect of foreign currency translation	(48)	3
Fair value of plan assets at end of period	562	554	486
Funded status	(136)	(89)
Amounts recognized in the Consolidated Balance Sheets
Pension assets included in other non-current assets	35	40
Current liabilities	(2)	(1)
Accrued benefit liability included in other non-current liabilities	(169)	(128)
Net amount recognized	(136)	(89)
Amounts recognized in Accumulated Other Comprehensive Income/(Loss), before tax
Net loss	65	(56)
Settlement loss	(6)
Amortization of net loss	(3)	(6)	(4)
Total recognized in other comprehensive income/(loss)	56	(62)
Amounts not yet reflected in net periodic benefit cost and included in Accumulated Other Comprehensive Income/(Loss), before tax
Unrecognized losses	$ 144	$ 88

Defined benefit plan acquisition and divestitures benefit obligation.

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Defined benefit plan amendments and other changes.

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Defined benefit plan expenses on plan assets.

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Defined benefit plan expenses paid.

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Defined Benefit Plan Insurance On Plan Assets

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Defined benefit plan premium on plan assets.

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Defined benefit plan premiums paid.

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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 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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-Publisher FASB

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

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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 aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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Amount before tax, after reclassification adjustments, of actuarial gain (loss) that has not been recognized in the income statement.

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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 amount of increase in the plan assets attributed to a business combination.

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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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The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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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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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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No definition available.

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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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Amount of net gain (loss) recognized in net periodic benefit cost due to settlements and curtailments. Curtailments result from an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. Settlements result from an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits.

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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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The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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The amount that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts.

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