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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, 2016
Mar. 31, 2015
Jul. 10, 2013
Debt Instrument [Line Items]      
Net premiums $ 597    
Current and long-term debt, financing and capital lease obligations 33,958    
Less current portion (4,690) $ (1,300)  
Long-term debt, financing and capital lease obligations 29,268 32,342  
Exchangeable Notes [Member] | Clearwire Communications LLC [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage     8.25%
Long-term debt, gross     $ 629
Successor [Member]      
Debt Instrument [Line Items]      
Net premiums 597 917  
Current and long-term debt, financing and capital lease obligations 33,958 33,642  
Less current portion (4,690) (1,300)  
Long-term debt, financing and capital lease obligations $ 29,268 32,342  
Successor [Member] | 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  
Successor [Member] | 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  
Successor [Member] | Senior Notes [Member] | Sprint Nextel Corporation Guaranteed Notes [Member]      
Debt Instrument [Line Items]      
Maturity date, start Dec. 01, 2016    
Maturity date, end Nov. 15, 2022    
Long-term debt, gross $ 9,280 9,280  
Successor [Member] | 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  
Successor [Member] | 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] $ 300 300  
Successor [Member] | Exchangeable Notes [Member] | Clearwire Communications LLC [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage [1] 8.25%    
Debt instrument, maturity date [1] Dec. 01, 2040    
Long-term debt, gross [1] $ 629 629  
Successor [Member] | Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility expires in 2018 [Member]      
Debt Instrument [Line Items]      
Percentage bearing variable interest, percentage rate 3.94%    
Maturity date, end Feb. 28, 2018    
Line of credit facility, amount outstanding $ 0 0  
Successor [Member] | Line of Credit [Member] | Export Development Canada Credit Facilities [Member]      
Debt Instrument [Line Items]      
Maturity date, start Dec. 15, 2017    
Maturity date, end Dec. 17, 2019    
Line of credit facility, amount outstanding $ 550 800  
Successor [Member] | Line of Credit [Member] | Secured Equipment Credit Facilities [Member]      
Debt Instrument [Line Items]      
Maturity date, start Mar. 30, 2017    
Maturity date, end Dec. 19, 2021    
Line of credit facility, amount outstanding $ 805 610  
Successor [Member] | Financing Obligation [Member]      
Debt Instrument [Line Items]      
Maturity date, start Nov. 19, 2017    
Maturity date, end Sep. 30, 2021    
Long-term debt, gross $ 828 275  
Successor [Member] | Capital Lease Obligations and Other [Member]      
Debt Instrument [Line Items]      
Maturity date, start Apr. 30, 2016    
Maturity date, end Nov. 21, 2023    
Long-term debt, gross $ 265 $ 127  
Minimum [Member] | Successor [Member] | Senior Notes [Member] | Sprint Corporation [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 7.13%    
Minimum [Member] | Successor [Member] | Senior Notes [Member] | Sprint Capital Corporation [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 6.88%    
Minimum [Member] | Successor [Member] | Senior Notes [Member] | Sprint Nextel Corporation Guaranteed Notes [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 6.00%    
Minimum [Member] | Successor [Member] | Guaranteed Notes [Member] | Sprint Nextel Corporation Guaranteed Notes [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 7.00%    
Minimum [Member] | Successor [Member] | Line of Credit [Member] | Export Development Canada Credit Facilities [Member]      
Debt Instrument [Line Items]      
Percentage bearing variable interest, percentage rate 4.16%    
Minimum [Member] | Successor [Member] | Line of Credit [Member] | Secured Equipment Credit Facilities [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 2.02%    
Minimum [Member] | Successor [Member] | Financing Obligation [Member]      
Debt Instrument [Line Items]      
Percentage bearing fixed interest, percentage rate 2.02%    
Minimum [Member] | Successor [Member] | Capital Lease Obligations and Other [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 2.35%    
Maximum [Member] | Successor [Member] | Senior Notes [Member] | Sprint Corporation [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 7.88%    
Maximum [Member] | Successor [Member] | Senior Notes [Member] | Sprint Capital Corporation [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 8.75%    
Maximum [Member] | Successor [Member] | Senior Notes [Member] | Sprint Nextel Corporation Guaranteed Notes [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 11.50%    
Maximum [Member] | Successor [Member] | Guaranteed Notes [Member] | Sprint Nextel Corporation Guaranteed Notes [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 9.00%    
Maximum [Member] | Successor [Member] | Line of Credit [Member] | Export Development Canada Credit Facilities [Member]      
Debt Instrument [Line Items]      
Percentage bearing variable interest, percentage rate 5.91%    
Maximum [Member] | Successor [Member] | Line of Credit [Member] | Secured Equipment Credit Facilities [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 2.75%    
Maximum [Member] | Successor [Member] | Financing Obligation [Member]      
Debt Instrument [Line Items]      
Percentage bearing fixed interest, percentage rate 6.10%    
Maximum [Member] | Successor [Member] | Capital Lease Obligations and Other [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage 10.52%    
[1] (1)Notes of Clearwire Communications LLC are also direct obligations of Clearwire Finance, Inc. and are guaranteed by certain Clearwire subsidiaries.