Allowance For Doubtful Accounts Writeoffs Net Of Recoveries

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- Definition

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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- Definition

defined contribution maximum percentage of participant's eligible compensation

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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 Fixed Matching Contributions

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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 Valued at Level 1

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Percent of Fair Value of Plan Assets at Level 2

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- Definition

Percent of Fair Value of Plan Assets Valued at Level 3

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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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-Name Accounting Standards Codification

-Topic 720

-SubTopic 35

-Section 50

-Paragraph 1

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-Name Statement of Position (SOP)

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- Definition

Amount of gain (loss) from a decision to temporarily deviate from the substantive plan, or from a change in benefit obligation or plan asset value from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover or salary scale.

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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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-SubTopic 30

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

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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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-Glossary Accumulated Postretirement Benefit Obligation

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Projected Benefit Obligation

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The employer's best estimate, as soon as it can be reasonably determined, 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. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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- Definition

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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- Definition

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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- 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

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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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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- 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).

+ References

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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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-Publisher FASB

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-Topic 718

-SubTopic 10

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-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

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-Number 123R

-Paragraph A240

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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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-SubTopic 10

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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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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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- Definition

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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- Definition

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

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- Definition

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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- Definition

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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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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-Paragraph A240

-Subparagraph b(1)(a)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Summary of Significant Accounting Policies and Other Information (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	2 Months Ended	12 Months Ended
	Feb. 27, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance For Doubtful Accounts Writeoffs Net Of Recoveries		$ 549,000,000	$ 519,000,000	$ 437,000,000
Defined Benefit Plan, Fair Value of Plan Assets		1,600,000,000	1,400,000,000
Defined Benefit Plan, Benefit Obligation		2,700,000,000	2,200,000,000
Defined Benefit Plan, Funded Status of Plan		1,100,000,000	800,000,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year		3,000,000
Defined Benefit Plan, Actuarial Net (Gains) Losses		(404,000,000)	(349,000,000)	(171,000,000)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		4.30%	5.40%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	7.75%	8.00%
Defined Benefit Plan Deviation from Target Allocation Percentage Plus or Minus		5.00%
Percent of Fair Value of Plan Assets Valued at Level 1		54.00%
Percent of Fair Value of Plan Assets at Level 2		28.00%
Percent of Fair Value of Plan Assets Valued at Level 3		18.00%
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		30,000,000	31,000,000
Defined Contribution Percentage of Discretionary Match Of Participants Contributions Maximum		3.95%	1.20%	0.70%
Defined Contribution Plan Discretionary Contribution		60,000,000	20,000,000	9,000,000
Defined contribution plan percentage of discretionary match		100.00%	100.00%	100.00%
Percentage of Operating Revenues Related to Universal Service Fund Fees		2.00%	2.00%	2.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures		12
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 1.22
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum		1.15%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum		59.40%
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		6 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		63
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number		39
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		13
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 2.23
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number		15
Pre Tax Share And Non Share Based Compensation Charges		82,000,000	73,000,000	70,000,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense		14,000,000	13,000,000	(18,000,000)
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized		39,000,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition		1 year 8 months 16 days
Advertising Expense		$ 1,400,000,000	$ 1,400,000,000	$ 1,400,000,000
Network Equipment, Site Costs and Related Software [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life		3 years
Network Equipment, Site Costs and Related Software [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life		30 years
Building and Building Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life		3 years
Building and Building Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life		30 years
Non-network Internal Use Software Office Equipment And Other [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life		3 years
Non-network Internal Use Software Office Equipment And Other [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life		12 years
Network and Non-network Software [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life		3 years
Network and Non-network Software [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life		5 years
U.S. Equity Securities [Member]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	41.00%	50.00%
International Equity Securities [Member] [Member]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	18.00%	15.00%
Fixed Income Securities [Member]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	21.00%	15.00%
Real Estate Investment [Member]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	10.00%	10.00%
Other Investment Companies [Member]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	10.00%	10.00%