Basis of Presentation and Other Information	9 Months Ended
Dec. 31, 2018
Nature of Operations [Abstract]
Basis of Presentation and Other Information	Basis of Presentation and Other Information Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X for interim financial information. All normal recurring adjustments considered necessary for a fair presentation have been included. Certain disclosures normally included in annual consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP) have been omitted. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes contained in our Annual report on Form 10-K for the year ended March 31, 2018. Unless the context otherwise requires, references to "Sprint," "we," "us," "our" and the "Company" mean Sprint Corporation and its consolidated subsidiaries for all periods presented, and references to "Sprint Communications" are to Sprint Communications, Inc. and its consolidated subsidiaries. The preparation of the unaudited interim consolidated financial statements requires management of the Company to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities at the date of the unaudited interim consolidated financial statements. These estimates are inherently subject to judgment and actual results could differ. The consolidated financial statements include our accounts, those of our 100% owned subsidiaries, and subsidiaries we control or in which we have a controlling financial interest. For controlled subsidiaries that are not wholly-owned, the noncontrolling interests are included in "Net (loss) income" and "Total equity." All intercompany transactions and balances have been eliminated in consolidation. Reclassification of Prior Period Amounts Certain prior period amounts have been reclassified to conform to the current period presentation. As a result of the growing significance of our leasing program, in fiscal year 2017 we disaggregated equipment revenue between device sales and device operating lease revenue in our consolidated statements of comprehensive (loss) income. Revenue derived from device sales is now being reported in a new caption called "Equipment sales," and revenue derived from device operating leases is now being reported in a new caption called "Equipment rentals." For the three- and nine-month periods ended December 31, 2017, we have disaggregated revenues of $1.0 billion and $2.9 billion, respectively, from equipment revenue to "Equipment rentals." To align with the changes made to our revenue presentation, we have added two new captions within the consolidated statements of comprehensive (loss) income to capture certain costs directly attributable to our leasing activities consisting of "Cost of equipment rentals (exclusive of depreciation)" and "Depreciation - equipment rentals." For the three- and nine-month periods ended December 31, 2017, we have reclassed $123 million and $347 million, respectively, of loss on disposal of property, plant and equipment, net of recoveries resulting from the write-off of leased devices from "Other, net" to a new caption called "Cost of equipment rentals (exclusive of depreciation)." Additionally, we disaggregated total depreciation between network and other versus depreciation related to equipment rentals. Network and other depreciation is now being reported in a new caption called "Depreciation - network and other," and depreciation derived from equipment rentals is now being reported in a new caption called "Depreciation - equipment rentals." For the three- and nine-month periods ended December 31, 2017, we have disaggregated depreciation of $990 million and $2.7 billion, respectively, from depreciation to "Depreciation - equipment rentals." Total net operating revenues, net operating expenses, net (loss) income, and basic and diluted earnings per share were not affected by these reclassifications. On January 1, 2018, the Company adopted authoritative guidance regarding Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments. The Company adopted this standard with retrospective application to the consolidated statements of cash flows. The standard impacted the presentation of cash flows related to beneficial interests in securitization transactions, which is the deferred purchase price associated with our accounts receivable facility, resulting in reclassification of cash inflows from operating activities to investing activities of $909 million for the nine-month period ended December 31, 2017 in our consolidated statements of cash flows. The standard also impacted the presentation of cash flows related to separately identifiable cash flows and application of the predominance principal primarily related to direct channel leased devices resulting in a material reclassification of cash outflows from operating activities to investing activities of $3.8 billion for the nine-month period ended December 31, 2017 in our consolidated statements of cash flows. In addition, the standard also impacted the presentation of cash flows related to debt prepayment or debt extinguishment costs and resulted in a reclassification of cash outflows from operating activities to financing activities of $129 million for the nine-month period ended December 31, 2017 in our consolidated statements of cash flows. Proceeds from the settlement of corporate-owned life insurance policies resulted in a $2 million reclassification between operating and investing activities in our consolidated statements of cash flows for the nine-month period ended December 31, 2017. On January 1, 2018, the Company adopted authoritative guidance regarding Statement of Cash Flows: Restricted Cash, requiring that amounts generally described as restricted cash or restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted this standard with retrospective application to the consolidated statements of cash flows. The adoption of this standard resulted in an increase of $72 million in the beginning balance of cash, cash equivalents and restricted cash on April 1, 2017 and $55 million to the ending balance of cash, cash equivalents and restricted cash as of December 31, 2017. Business Combination Agreement On April 29, 2018, we announced that we entered into a Business Combination Agreement with T-Mobile US (T-Mobile) to merge in an all-stock transaction for a fixed exchange ratio of 0.10256 of T-Mobile shares for each Sprint share, or the equivalent of 9.75 Sprint shares for each T-Mobile share. Immediately following the transactions, Deutsche Telekom AG and SoftBank Group Corp. are expected to hold approximately 42% and 27% of fully-diluted shares of the combined company, respectively, with the remaining 31% of the fully-diluted shares of the combined company held by public stockholders. The Board will consist of 14 directors, of which nine will be nominated by Deutsche Telekom AG, four will be nominated by SoftBank Group Corp, and the final director will be the CEO of the combined company. The combined company will be named T-Mobile. The transaction is subject to customary closing conditions, including regulatory approvals, and is expected to close in the first half of calendar year 2019. Sprint and T-Mobile completed the Hart-Scott-Rodino filing with the Department of Justice on May 24, 2018. On June 18, 2018, the parties filed with the FCC the merger applications, including the Public Interest Statement. On July 18, 2018, the FCC accepted the applications for filing and established a public comment period for the transaction. The formal comment period concluded on October 31, 2018. The transaction received clearance from the Committee on Foreign Investment in the United States on December 17, 2018 and is awaiting further regulatory approvals.

Basis of Presentation and Other Information

Basis of Presentation

The accompanying unaudited consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X for interim financial information. All normal recurring adjustments considered necessary for a fair presentation have been included. Certain disclosures normally included in annual consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP) have been omitted. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes contained in our Annual report on Form 10-K for the year ended March 31, 2018. Unless the context otherwise requires, references to "Sprint," "we," "us," "our" and the "Company" mean Sprint Corporation and its consolidated subsidiaries for all periods presented, and references to "Sprint Communications" are to Sprint Communications, Inc. and its consolidated subsidiaries.

The preparation of the unaudited interim consolidated financial statements requires management of the Company to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities at the date of the unaudited interim consolidated financial statements. These estimates are inherently subject to judgment and actual results could differ.

The consolidated financial statements include our accounts, those of our 100% owned subsidiaries, and subsidiaries we control or in which we have a controlling financial interest. For controlled subsidiaries that are not wholly-owned, the noncontrolling interests are included in "Net (loss) income" and "Total equity." All intercompany transactions and balances have been eliminated in consolidation.

Reclassification of Prior Period Amounts

Certain prior period amounts have been reclassified to conform to the current period presentation. As a result of the growing significance of our leasing program, in fiscal year 2017 we disaggregated equipment revenue between device sales and device operating lease revenue in our consolidated statements of comprehensive (loss) income. Revenue derived from device sales is now being reported in a new caption called "Equipment sales," and revenue derived from device operating leases is now being reported in a new caption called "Equipment rentals." For the three- and nine-month periods ended December 31, 2017, we have disaggregated revenues of $1.0 billion and $2.9 billion, respectively, from equipment revenue to "Equipment rentals."

To align with the changes made to our revenue presentation, we have added two new captions within the consolidated statements of comprehensive (loss) income to capture certain costs directly attributable to our leasing activities consisting of "Cost of equipment rentals (exclusive of depreciation)" and "Depreciation - equipment rentals." For the three- and nine-month periods ended December 31, 2017, we have reclassed $123 million and $347 million, respectively, of loss on disposal of property, plant and equipment, net of recoveries resulting from the write-off of leased devices from "Other, net" to a new caption called "Cost of equipment rentals (exclusive of depreciation)." Additionally, we disaggregated total depreciation between network and other versus depreciation related to equipment rentals. Network and other depreciation is now being reported in a new caption called "Depreciation - network and other," and depreciation derived from equipment rentals is now being reported in a new caption called "Depreciation - equipment rentals." For the three- and nine-month periods ended December 31, 2017, we have disaggregated depreciation of $990 million and $2.7 billion, respectively, from depreciation to "Depreciation - equipment rentals."

Total net operating revenues, net operating expenses, net (loss) income, and basic and diluted earnings per share were not affected by these reclassifications.

On January 1, 2018, the Company adopted authoritative guidance regarding Statement of Cash Flows: Classification of Certain Cash Receipts and Cash Payments. The Company adopted this standard with retrospective application to the consolidated statements of cash flows. The standard impacted the presentation of cash flows related to beneficial interests in securitization transactions, which is the deferred purchase price associated with our accounts receivable facility, resulting in reclassification of cash inflows from operating activities to investing activities of $909 million for the nine-month period ended December 31, 2017 in our consolidated statements of cash flows. The standard also impacted the presentation of cash flows related to separately identifiable cash flows and application of the predominance principal primarily related to direct channel leased devices resulting in a material reclassification of cash outflows from operating activities to investing activities of $3.8 billion for the nine-month period ended December 31, 2017 in our consolidated statements of cash flows. In addition, the standard also impacted the presentation of cash flows related to debt prepayment or debt extinguishment costs and resulted in a reclassification of cash outflows from operating activities to financing activities of $129 million for the nine-month period ended December 31, 2017 in our consolidated statements of cash flows. Proceeds from the settlement of corporate-owned life insurance policies resulted in a $2 million reclassification between operating and investing activities in our consolidated statements of cash flows for the nine-month period ended December 31, 2017.

On January 1, 2018, the Company adopted authoritative guidance regarding Statement of Cash Flows: Restricted Cash, requiring that amounts generally described as restricted cash or restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted this standard with retrospective application to the consolidated statements of cash flows. The adoption of this standard resulted in an increase of $72 million in the beginning balance of cash, cash equivalents and restricted cash on April 1, 2017 and $55 million to the ending balance of cash, cash equivalents and restricted cash as of December 31, 2017.

Business Combination Agreement

On April 29, 2018, we announced that we entered into a Business Combination Agreement with T-Mobile US (T-Mobile) to merge in an all-stock transaction for a fixed exchange ratio of 0.10256 of T-Mobile shares for each Sprint share, or the equivalent of 9.75 Sprint shares for each T-Mobile share. Immediately following the transactions, Deutsche Telekom AG and SoftBank Group Corp. are expected to hold approximately 42% and 27% of fully-diluted shares of the combined company, respectively, with the remaining 31% of the fully-diluted shares of the combined company held by public stockholders. The Board will consist of 14 directors, of which nine will be nominated by Deutsche Telekom AG, four will be nominated by SoftBank Group Corp, and the final director will be the CEO of the combined company. The combined company will be named T-Mobile. The transaction is subject to customary closing conditions, including regulatory approvals, and is expected to close in the first half of calendar year 2019. Sprint and T-Mobile completed the Hart-Scott-Rodino filing with the Department of Justice on May 24, 2018. On June 18, 2018, the parties filed with the FCC the merger applications, including the Public Interest Statement. On July 18, 2018, the FCC accepted the applications for filing and established a public comment period for the transaction. The formal comment period concluded on October 31, 2018. The transaction received clearance from the Committee on Foreign Investment in the United States on December 17, 2018 and is awaiting further regulatory approvals.