Allowance For Doubtful Accounts Writeoffs Net Of Recoveries

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Allowable Deviation from target allocation percentage in investment classifcations to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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No definition available.

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- Definition

defined contribution maximum percentage of participant's eligible compensation

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- Definition

Defined Contribution Percentage of Discretionary Match Of Participants Contributions Maximum

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- Definition

defined contribution plan discretionary contribution

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- Definition

Defined Contribution Plan, Employer Matching Contribution, Percent, Additional Contribution

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Defined Contribution Plan, Employer Matching Contribution, Percent, Base Contribution

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Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Additional Contribution

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Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Base Contribution

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- Definition

Defined Contribution Plan Fixed Matching Contributions

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- Definition

Defined contribution plan percentage of discretionary match

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- Definition

percentage of operating revenues related to universal service fund fees

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- Definition

Percent Of Fair Value Of Plan Assets Measured at Fair Value

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- Definition

Pre Tax Share And Non Share Based Compensation Charges

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- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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- Definition

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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-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Gain or Loss

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- Definition

The interest rate used to adjust for the time value of money for the plan.

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Glossary Expected Long-Term Rate of Return on Plan Assets

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-SubTopic 20

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-Subparagraph (k)(3)

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- Definition

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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-Subparagraph (a)

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-Glossary Projected Benefit Obligation

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-Glossary Accumulated Postretirement Benefit Obligation

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

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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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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 of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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No definition available.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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-Name Accounting Standards Codification

-Topic 460

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-Section 50

-Paragraph 4

-Subparagraph (b)(1)

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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-SubTopic 10

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-Paragraph 2

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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-SubTopic 10

-Section 50

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section D

-Subsection 2

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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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Period Type:	instant

Summary of Significant Accounting Policies and Other Information (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended	3 Months Ended								4 Months Ended	12 Months Ended	4 Months Ended	12 Months Ended	4 Months Ended	12 Months Ended	4 Months Ended	12 Months Ended	4 Months Ended	12 Months Ended	3 Months Ended		12 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 30, 2012	Dec. 31, 2013	Mar. 31, 2014 Network equipment, site costs and related software [Member] Minimum [Member]	Mar. 31, 2014 Network equipment, site costs and related software [Member] Maximum [Member]	Mar. 31, 2014 Building and Building Improvements [Member] Minimum [Member]	Mar. 31, 2014 Building and Building Improvements [Member] Maximum [Member]	Mar. 31, 2014 Non-network Internal Use Software Office Equipment And Other [Member] Minimum [Member]	Mar. 31, 2014 Non-network Internal Use Software Office Equipment And Other [Member] Maximum [Member]	Mar. 31, 2014 Network and Non-network Software [Member] Minimum [Member]	Mar. 31, 2014 Network and Non-network Software [Member] Maximum [Member]	Mar. 31, 2014 U.S. Equity Securities [Member]	Dec. 31, 2013 U.S. Equity Securities [Member]	Mar. 31, 2014 International Equity Securities [Member] [Member]	Dec. 31, 2013 International Equity Securities [Member] [Member]	Mar. 31, 2014 Fixed Income Securities [Member]	Dec. 31, 2013 Fixed Income Securities [Member]	Mar. 31, 2014 Real Estate Investment [Member]	Dec. 31, 2013 Real Estate Investment [Member]	Mar. 31, 2014 Other Investment Companies [Member]	Dec. 31, 2013 Other Investment Companies [Member]	Mar. 31, 2014 Successor [Member]	Mar. 31, 2013 Successor [Member]	Dec. 31, 2013 Successor [Member]	Dec. 31, 2012 Successor [Member]	Mar. 31, 2013 Predecessor [Member]	Jul. 10, 2013 Predecessor [Member]	Dec. 31, 2012 Predecessor [Member]	Dec. 31, 2011 Predecessor [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Fair Value, Inputs, Level 3 [Member]
Allowance For Doubtful Accounts Writeoffs Net Of Recoveries																						$ 106,000,000		$ 98,000,000		$ 105,000,000	$ 374,000,000	$ 549,000,000	$ 519,000,000
Property, Plant and Equipment, Useful Life				3 years	30 years	3 years	30 years	3 years	12 years	3 years	5 years
Maximum amount of the guarantee liability	265,000,000
Defined Benefit Plan, Fair Value of Plan Assets																						1,800,000,000		1,800,000,000				1,600,000,000
Defined Benefit Plan, Benefit Obligation																						2,400,000,000		2,300,000,000				2,700,000,000
Defined Benefit Plan, Funded Status of Plan																						600,000,000		500,000,000				1,100,000,000
Defined Benefit Plan, Contributions by Employer																						10,000,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year																						68,500,000
Defined Benefit Plan, Actuarial Net (Gains) Losses		0																				(147,000,000)	0	93,000,000		0	0	(404,000,000)	(349,000,000)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate																						4.90%		5.30%	4.30%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.75%		7.75%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities												38.00%	41.00%	16.00%	18.00%	28.00%	21.00%	9.00%	10.00%	9.00%	10.00%
Defined Benefit Plan Deviation from Target Allocation Percentage Plus or Minus			5.00%
Investment Owned, Percent of Net Assets																														48.00%	33.00%	19.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Base Contribution																						100.00%		100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent, Base Contribution																						3.00%		3.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Additional Contribution																						50.00%		50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent, Additional Contribution																						2.00%		2.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent																						4.00%		4.00%
Defined Contribution Percentage Match of Participants Contributions Maximum																												50.00%	50.00%
Defined Contribution Maximum Percentage of Participant's Eligible Compensation																												2.00%	2.00%
Defined Contribution Plan Fixed Matching Contributions																						15,000,000		35,000,000		15,000,000	32,000,000	30,000,000	31,000,000
Defined contribution plan percentage of discretionary match																												100.00%
Defined Contribution Percentage of Discretionary Match Of Participants Contributions Maximum																												3.95%	1.20%
Defined Contribution Plan Discretionary Contribution																												60,000,000	20,000,000
Percentage of Operating Revenues Related to Universal Service Fund Fees																						2.00%		2.00%		2.00%		2.00%	2.00%
the number of shares available and reserved for future grants under the 2007 Plan and ESPP	198
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures																						0		1.7
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value																								$ 3.63
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum																								2.01%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum																								42.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate																								0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term																								7 years 6 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	43
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	37
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value																								$ 6.23			$ 5.96
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	28
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																								18			2
Pre Tax Share And Non Share Based Compensation Charges																						35,000,000		98,000,000		17,000,000	37,000,000	82,000,000	73,000,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense																						12,000,000		34,000,000		(1,000,000)	2,000,000	14,000,000	13,000,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	101,000,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2 years 0 months 12 days
Advertising Expense																						$ 408,000,000		$ 697,000,000		$ 409,000,000	$ 858,000,000	$ 1,400,000,000	$ 1,400,000,000