Allowance For Doubtful Accounts Writeoffs Net Of Recoveries

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- Definition

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

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No definition available.

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- Definition

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

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- Definition

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

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No definition available.

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- Definition

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

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No definition available.

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- Definition

Defined Contribution Plan Fixed Matching Contributions

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No definition available.

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- Definition

Effect of the change in estimate which reduced operating income (loss)

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No definition available.

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- Definition

Effect of the change in estimate which reduced operating income loss per each share of common stock or unit outstanding during the reporting period.

+ References

No definition available.

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- Definition

Installment Billing Maximum Payment Term

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No definition available.

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- Definition

Percent Of Fair Value Of Plan Assets Measured at Fair Value

+ References

No definition available.

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- Definition

percentage of operating revenues related to universal service fund fees

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No definition available.

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- Definition

Pre Tax Share And Non Share Based Compensation Charges

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No definition available.

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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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-Topic 720
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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

+ References

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- Definition

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

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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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- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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

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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- Definition

The amount of increase related to special termination benefits offered to and accepted by employees in connection with their termination of employment that are only offered for a short period of time. A situation involving termination benefits may also involve a curtailment.

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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

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

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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- 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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- Definition

The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) 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

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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- 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 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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- 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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No definition available.

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The estimated measure of the minimum 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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No definition available.

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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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No definition available.

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

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No definition available.

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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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- 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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- Definition

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

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- Definition

Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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Summary of Significant Accounting Policies and Other Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2014	Dec. 31, 2015	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2013
Effect of the change in estimate which reduced operating income (loss)							$ 80
Effect of the change in estimate which reduced operating income loss per each share of common stock or unit outstanding							$ 0.02
Allowance For Doubtful Accounts Writeoffs Net Of Recoveries					$ 371	$ 612	$ 752
Defined Benefit Plan, Special Termination Benefits							560
Pension expense							59
Defined Benefit Plan, Settlements, Benefit Obligation							300
Defined Benefit Plan, Fair Value of Plan Assets	$ 1,300				1,400	1,300
Defined Benefit Plan, Benefit Obligation	2,200				2,200	2,200
Defined Benefit Plan, Funded Status of Plan	$ (900)				(800)	(900)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax					35	$ (29)	$ (393)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.30%	4.90%				4.30%	4.20%
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)					$ 0	$ (9)	$ 0
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets					7.75%	7.75%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Base Contribution	50.00%		100.00%		50.00%		100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent, Base Contribution	4.00%		3.00%		4.00%		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 Plan Fixed Matching Contributions					$ 28	$ 54	$ 71
Percentage of Operating Revenues Related to Universal Service Fund Fees					2.00%	2.00%	2.00%
Installment billing maximum payment term					24 months
the number of shares available and reserved for future grants under the 2007 Plan and ESPP					211
Pre Tax Share And Non Share Based Compensation Charges					$ 93	$ 75	$ 86
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense					33	20	34
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized					251
Advertising Expense					$ 1,100	$ 1,300	$ 1,500
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					3 years 4 months 6 days
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, Leased Devices And Other [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life					3 years
Non-network Internal Use Software Office Equipment, Leased Devices 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					38.00%
International Equity Securities [Member] [Member]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities					16.00%
Fixed Income Securities [Member]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities					28.00%
Real Estate Investment [Member]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities					9.00%
Other Investment Companies [Member]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities					9.00%
Quoted prices in active markets [Member]
Investment Owned, Percent of Net Assets					34.00%
Observable [Member]
Investment Owned, Percent of Net Assets					48.00%
Unobservable [Member]
Investment Owned, Percent of Net Assets					18.00%
Options Held [Member]
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					$ 2.23
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum					1.23%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum					2.27%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum					53.60%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum					65.20%
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, Award Vesting Period					3 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term					10 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number					37
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number					17
Options Held [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term					5 years 6 months
Options Held [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term					6 years 6 months
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					55
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 5.64
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number					77
Restricted Stock Units (RSUs) [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					1 year
Restricted Stock Units (RSUs) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					3 years
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum					1.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum					1.92%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum					53.60%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum					70.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate					0.00%
Tranche one [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					4 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					50.00%
Tranche two [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					5 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage					50.00%
Scenario, Forecast [Member]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year				$ 50
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets				7.50%