Allowance For Doubtful Accounts Writeoffs Net Of Recoveries

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Call premiums paid on debt redemptions

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Cost of equipment rentals

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Cost of equipment sales

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Cumulative Effect of New Accounting Principle in Period of Adoption, Before Tax

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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, Base Contribution

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Defined Contribution Plan Fixed Matching Contributions

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Depreciation, equipment rentals

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Depreciation, network and other

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Installment Billing Maximum Payment Term

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Percent Of Fair Value Of Plan Assets Measured at Fair Value

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percentage of operating revenues related to universal service fund fees

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Pre Tax Share And Non Share Based Compensation Charges

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Revenue, equipment rentals, net

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Revenue, equipment sales, net

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The aggregate of amounts due from customers or clients, within one year of the balance sheet date (or one operating cycle, if longer), for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date within one year of the balance sheet, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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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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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The aggregate cost of goods produced and sold and services rendered during the reporting period.

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Total costs of sales and operating expenses for the period.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent.

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Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Summary of Significant Accounting Policies and Other Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Apr. 01, 2019	Apr. 01, 2018	Oct. 31, 2017	Mar. 31, 2016
Accounts and notes receivable, net	$ 3,554				$ 3,711					$ 3,554	$ 3,711			$ 3,808
Service										22,857	23,834	$ 25,368
Goodwill, Impairment Loss										2,000
Revenue, equipment rentals, net										5,137	4,048	3,295
Depreciation, equipment rentals										4,538	3,792	3,116
Allowance For Doubtful Accounts Writeoffs Net Of Recoveries										360	451	371
Defined Benefit Plan, Plan Assets, Amount	1,400				1,400					1,400	1,400
Defined Benefit Plan, Benefit Obligation	2,200				2,200					2,200	2,200
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ (800)				$ (800)					(800)	(800)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax										$ (49)	$ (30)	$ 35
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.10%				4.10%					4.10%	4.10%	4.30%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets										7.25%	7.50%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Base Contribution										100.00%	50.00%	50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent, Base Contribution										3.00%	4.00%	4.00%
Defined Contribution Plan Fixed Matching Contributions										$ 47	$ 38	$ 28
Percentage of Operating Revenues Related to Universal Service Fund Fees										1.00%	1.00%	2.00%
Installment Billing Maximum Payment Term										24 months
Number of shares available and reserved for future grants under the 2007 Plan and ESPP	190,000,000									190,000,000
Pre Tax Share And Non Share Based Compensation Charges										$ 132	$ 182	$ 93
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense										30	65	33
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 102									$ 102
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition										1 year 7 months 6 days
Advertising Expense										$ 1,100	1,300	1,100
Retained Earnings (Accumulated Deficit)	(1,883)				$ (1,255)					(1,883)	(1,255)			60
Proceeds from Sale and Collection of Receivables										223	1,140	10,498
Payments to Acquire Equipment on Lease										7,441	7,461	4,976
Call premiums paid on debt redemptions										0	131	0
Net cash provided by (used in) operating activities										10,429	10,062	(3,290)
Net cash provided by (used in) financing activities										483	210	(5,286)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	7,063				6,659					7,063	6,659	2,942				$ 2,641
Revenue from Contract with Customer, Excluding Assessed Tax										33,600
Revenue, equipment sales, net										5,606	4,524	4,684
Revenues	8,441	$ 8,601	$ 8,433	$ 8,125	8,083	$ 8,239	$ 7,927	$ 8,157		33,600	32,406	33,347
Net operating expenses:
Cost of services (exclusive of depreciation and amortization included below)										6,664	6,801	7,861
Cost of equipment sales										6,082	6,109	6,583
Cost of equipment rentals										643	493	975
Selling, general and administrative										7,774	8,087	7,994
Impairments										2,000	0	0
Depreciation, network and other										4,245	3,976	3,982
Amortization										608	812	1,052
Other Operating Income (Expense), Net										648	391	(20)
Costs and Expenses										33,202	29,679	31,583
Operating Income (Loss)	$ (1,674)	$ 479	$ 778	$ 815	$ 236	$ 727	$ 601	$ 1,163		398	2,727	1,764
Other income (expense), net										187	(59)	(40)
Nonoperating Income (Expense)										(2,376)	(2,424)	(2,535)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest										(1,978)	303	(771)
Income tax benefit (expense)										35	7,074	(435)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest										(1,943)	7,377	(1,206)
Net Income (Loss) Attributable to Noncontrolling Interest										$ 0	$ (12)	$ 0
Earnings Per Share, Basic	$ (0.53)	$ (0.03)	$ 0.05	$ 0.04	$ 0.02	$ 1.79	$ (0.01)	$ 0.05		$ (0.48)	$ 1.85	$ (0.30)
Earnings Per Share, Diluted	$ (530,000)	$ (30,000)	$ 50,000	$ 40,000	$ 20,000	$ 1,760,000	$ (10,000)	$ 50,000		$ (0.48)	$ 1.81	$ (0.30)
Weighted Average Number of Shares Outstanding, Basic										4,057,000,000	3,999,000,000	3,981,000,000
Weighted Average Number of Shares Outstanding, Diluted										4,057,000,000	4,078,000,000	3,981,000,000
Device and accessory inventory	$ 999				$ 1,003					$ 999	$ 1,003			979
Prepaid expenses and other current assets	1,289				575					1,289	575			846
Capitalized Contract Cost, Net	1,559									1,559				1,219
Other assets	1,118				921					1,118	921			964
Accrued expenses and other current liabilities	3,597				3,962					3,597	3,962			3,927
Deferred tax liabilities	7,556				7,294					7,556	7,294			7,660
Other liabilities	3,437				3,483					3,437	3,483			3,451
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (392)				$ (313)					(392)	$ (313)			(321)
Equipment sales [Member]
Revenue from Contract with Customer, Excluding Assessed Tax										5,606
Sales Channel, Through Intermediary [Member] \| Equipment sales [Member]
Revenue from Contract with Customer, Excluding Assessed Tax										$ 3,546
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%									38.00%
International Equity Securities [Member] [Member]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	16.00%									16.00%
Fixed Income Investments [Member]
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities	37.00%									37.00%
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%									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	27.00%									27.00%
Observable [Member]
Investment Owned, Percent of Net Assets	64.00%									64.00%
Unobservable [Member]
Investment Owned, Percent of Net Assets	9.00%									9.00%
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures											3,000,000.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value											$ 3.98
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum											1.93%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum											2.65%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum											41.90%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum											51.80%
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, Outstanding, Number	22,000,000									22,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	18,000,000									18,000,000
Employee Stock Option [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term											5 years 6 months
Employee Stock Option [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										17,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value										$ 5.35
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number	71,000,000									71,000,000
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											1.79%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum											2.42%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum											41.85%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum											51.79%
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%
Share-based Compensation Award, Tranche One modified [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period											2 years
Share-based Compensation Award, Tranche Two modified [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period											3 years
Share-based Compensation Award, Tranche Three [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period											4 years
Scenario, Forecast [Member]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year									$ 77
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets									7.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Base Contribution									100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent, Base Contribution									3.00%
Retained Earnings [Member] \| Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption, Before Tax														1,700
Cumulative Effect of New Accounting Principle in Period of Adoption														1,300
Retained Earnings [Member] \| Accounting Standards Update 2016-01 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption, Before Tax														0
Cumulative Effect of New Accounting Principle in Period of Adoption														$ 0
Adjustments for New Accounting Pronouncement [Member] \| Scenario, Forecast [Member]
Finance Lease, Right-of-Use Asset													$ 600
Net operating expenses:
Operating Lease, Liability													$ 7,000