| Document and Entity Information | Apr. 01, 2020 |
| Cover [Abstract] | |
| Entity Registrant Name | SPRINT Corp |
| Amendment Flag | false |
| Entity Central Index Key | 0000101830 |
| Current Fiscal Year End Date | --03-31 |
| Document Type | 8-K |
| Document Period End Date | Apr. 1, 2020 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 1-04721 |
| Entity Tax Identification Number | 46-1170005 |
| Entity Address, Address Line One | 6200 Sprint Parkway |
| Entity Address, City or Town | Overland Park |
| Entity Address, State or Province | KS |
| Entity Address, Postal Zip Code | 66251 |
| City Area Code | (913) |
| Local Phone Number | 794-1091 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common stock, $0.01 par value |
| Trading Symbol | S |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
