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Guarantor Financial Information (Details)
$ in Millions
Jun. 30, 2018
USD ($)
Feb. 20, 2018
USD ($)
Dec. 31, 2016
USD ($)
Nov. 30, 2015
USD ($)
Feb. 24, 2015
USD ($)
Dec. 12, 2013
USD ($)
Sep. 11, 2013
USD ($)
Condensed Financial Statements, Captions [Line Items]              
Ratio Of Total Indebtedness To Adjusted EBITDA 2.5            
Maximum Funding Limit       $ 4,500      
Non-Guarantor Subsidiaries [Member]              
Condensed Financial Statements, Captions [Line Items]              
Other Additional Capital $ 1,500   $ 42        
Notes Payable, Related Parties $ 24,000            
Sprint Communications Inc. Guaranteed Notes due 2021 [Member] | Senior Notes [Member]              
Condensed Financial Statements, Captions [Line Items]              
Debt instrument face amount             $ 2,250
Debt Instrument, Interest Rate, Stated Percentage             7.25%
Sprint Corporation 7.875% [Member] | Senior Notes [Member]              
Condensed Financial Statements, Captions [Line Items]              
Debt instrument face amount             $ 4,250
Debt Instrument, Interest Rate, Stated Percentage             7.875%
Sprint Corporation 7.125% [Member] [Member] | Senior Notes [Member]              
Condensed Financial Statements, Captions [Line Items]              
Debt instrument face amount           $ 2,500  
Debt Instrument, Interest Rate, Stated Percentage           7.125%  
Sprint Corporation 7.625% [Member] | Senior Notes [Member]              
Condensed Financial Statements, Captions [Line Items]              
Debt instrument face amount   $ 1,500     $ 1,500    
Debt Instrument, Interest Rate, Stated Percentage         7.625%    
Sprint Corporation [Member] | Senior Notes [Member]              
Condensed Financial Statements, Captions [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage   7.625%