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Long-Term Debt, Financing and Capital Lease Obligations (Schedule of Long-term Debt Instruments) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2017
Feb. 02, 2017
Oct. 31, 2016
Mar. 31, 2016
Jul. 10, 2013
Debt Instrument [Line Items]          
Long-term debt, gross   $ 6,000      
Net premiums $ 90     $ 597  
Current and long-term debt, financing and capital lease obligations 40,914     33,958  
Less current portion (5,036)     (4,690)  
Long-term debt, financing and capital lease obligations $ 35,878     29,268  
Senior Notes [Member] | Sprint Corporation [Member]          
Debt Instrument [Line Items]          
Maturity date, start Sep. 15, 2021        
Maturity date, end Feb. 15, 2025        
Long-term debt, gross $ 10,500     10,500  
Senior Notes [Member] | Sprint Capital Corporation [Member]          
Debt Instrument [Line Items]          
Maturity date, start May 01, 2019        
Maturity date, end Mar. 15, 2032        
Long-term debt, gross $ 6,204     6,204  
Senior Notes [Member] | Sprint Nextel Corporation Guaranteed Notes [Member]          
Debt Instrument [Line Items]          
Maturity date, start Aug. 15, 2017        
Maturity date, end Nov. 15, 2022        
Long-term debt, gross $ 6,280     9,280  
Guaranteed Notes [Member] | Sprint Nextel Corporation Guaranteed Notes [Member]          
Debt Instrument [Line Items]          
Maturity date, start Nov. 15, 2018        
Maturity date, end Mar. 01, 2020        
Long-term debt, gross $ 4,000     4,000  
Secured Notes [Member] | Sprint Spectrum Co LLC, Sprint Spectrum Co II LLC, Sprint Spectrum Co III LLC [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 3.36%   3.36%    
Debt instrument, maturity date [1] Sep. 20, 2021        
Long-term debt, gross $ 3,500     0  
Secured Notes [Member] | Clearwire Communications LLC [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage [1] 14.75%        
Debt instrument, maturity date [1] Dec. 01, 2016        
Long-term debt, gross [1] $ 0     300  
Exchangeable Notes [Member] | Clearwire Communications LLC [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 8.25%       8.25%
Debt instrument, maturity date [1] Dec. 01, 2017        
Long-term debt, gross $ 629 [1]     629  
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility expires in 2018 [Member]          
Debt Instrument [Line Items]          
Percentage bearing variable interest, percentage rate 3.50%        
Maturity date, end Feb. 03, 2021        
Line of credit facility, amount outstanding $ 0     0  
Secured term loan [Member] | Sprint Nextel Corporation Guaranteed Notes [Member]          
Debt Instrument [Line Items]          
Percentage bearing variable interest, percentage rate 3.50%        
Maturity date, end Feb. 03, 2024        
Long-term debt, gross   $ 4,000      
Line of credit facility, amount outstanding $ 4,000     0  
Receivable Facility, amount outstanding [Member] | Sprint Nextel Corporation Guaranteed Notes [Member]          
Debt Instrument [Line Items]          
Maturity date, end Nov. 19, 2018        
Line of credit facility, amount outstanding $ 1,964     600  
Line of Credit [Member] | Export Development Canada Credit Facilities [Member]          
Debt Instrument [Line Items]          
Maturity date, end Dec. 17, 2019        
Line of credit facility, amount outstanding $ 300     550  
Line of Credit [Member] | Secured Equipment Credit Facilities [Member]          
Debt Instrument [Line Items]          
Maturity date, start Sep. 16, 2019        
Maturity date, end Dec. 20, 2021        
Line of credit facility, amount outstanding $ 431     805  
Line of Credit [Member] | Financing Obligations, Capital Lease Obligations and Other [Member]          
Debt Instrument [Line Items]          
Maturity date, start May 21, 2017        
Maturity date, end Jan. 01, 2024        
Financing Obligations, Capital Lease Obligations and Other [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross $ 3,016     $ 493  
Capital Lease Obligations [Member]          
Debt Instrument [Line Items]          
Long-term debt, gross $ 315        
Minimum [Member] | Senior Notes [Member] | Sprint Corporation [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 7.13%        
Minimum [Member] | Senior Notes [Member] | Sprint Capital Corporation [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 6.88%        
Minimum [Member] | Guaranteed Notes [Member] | Sprint Nextel Corporation Guaranteed Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 7.00%        
Minimum [Member] | Receivable Facility, amount outstanding [Member] | Sprint Nextel Corporation Guaranteed Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 2.02%        
Minimum [Member] | Line of Credit [Member] | Secured Equipment Credit Facilities [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 2.57%        
Minimum [Member] | Financing Obligations, Capital Lease Obligations and Other [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 2.35%        
Maximum [Member] | Senior Notes [Member] | Sprint Corporation [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 7.88%        
Maximum [Member] | Senior Notes [Member] | Sprint Capital Corporation [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 8.75%        
Maximum [Member] | Senior Notes [Member] | Sprint Nextel Corporation Guaranteed Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 11.50%        
Maximum [Member] | Guaranteed Notes [Member] | Sprint Nextel Corporation Guaranteed Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 9.00%        
Maximum [Member] | Receivable Facility, amount outstanding [Member] | Sprint Nextel Corporation Guaranteed Notes [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 2.51%        
Maximum [Member] | Line of Credit [Member] | Export Development Canada Credit Facilities [Member]          
Debt Instrument [Line Items]          
Percentage bearing variable interest, percentage rate 3.48%        
Maximum [Member] | Line of Credit [Member] | Secured Equipment Credit Facilities [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 3.27%        
Maximum [Member] | Financing Obligations, Capital Lease Obligations and Other [Member]          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 10.63%        
[1] (1)Notes of Clearwire Communications LLC are also direct obligations of Clearwire Finance, Inc. and are guaranteed by certain Clearwire subsidiaries.