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Long-Term Debt, Financing and Capital Lease Obligations (Schedule of Long-term Debt Instruments) (Details) - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Jul. 10, 2013
Debt Instrument [Line Items]      
Debt Instrument, Unamortized Premium (Discount), Net $ 946 $ 1,106  
Current and Long-term Debt, Financing and Capital Lease Obligations 33,965 33,831  
Long Term Debt Financing And Capital Lease Obligations, Current portion (1,395) (1,300)  
Long-term debt, financing and capital lease obligations $ 32,570 32,531  
Senior Notes [Member] | Sprint Corporation [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum 7.13%    
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 7.88%    
Maturity Date Range, Start Sep. 15, 2021    
Maturity Date Range, End Feb. 23, 2025    
Long-term Debt, Gross $ 10,500 10,500  
Senior Notes [Member] | Sprint Nextel Corporation [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum 6.00%    
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 11.50%    
Maturity Date Range, Start Dec. 01, 2016    
Maturity Date Range, End Nov. 15, 2022    
Long-term Debt, Gross $ 9,280 9,280  
Senior Notes [Member] | Sprint Capital Corporation [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum 6.88%    
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 8.75%    
Maturity Date Range, Start May 01, 2019    
Maturity Date Range, End Mar. 15, 2032    
Long-term Debt, Gross $ 6,204 6,204  
Guaranteed notes [Member] | Sprint Nextel Corporation [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum 7.00%    
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 9.00%    
Maturity Date Range, Start Nov. 15, 2018    
Maturity Date Range, End Mar. 01, 2020    
Long-term Debt, Gross $ 4,000 4,000  
Secured Debt [Member] | Clearwire Communications LLC [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 14.75%    
Debt Instrument, Maturity Date Dec. 01, 2016    
Long-term Debt, Gross [1] $ 300 300  
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 Dec. 01, 2040    
Long-term Debt, Gross [1] $ 629 629  
Revolving Credit Facility [Member] | Unsecured Revolving Credit Facility expires in 2018 [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 3.38%    
Maturity Date Range, End Feb. 28, 2018    
Line of Credit Facility, Amount Outstanding $ 0 0  
Line of Credit [Member] | Export Development Canada Agreement [Member]      
Debt Instrument [Line Items]      
Maturity Date Range, Start Dec. 15, 2015    
Maturity Date Range, End Dec. 17, 2019    
Line of Credit Facility, Amount Outstanding $ 800 800  
Line of Credit [Member] | Secured Equipment Credit Facility [Member]      
Debt Instrument [Line Items]      
Maturity Date Range, Start Mar. 30, 2017    
Maturity Date Range, End Mar. 30, 2020    
Line of Credit Facility, Amount Outstanding $ 889 610  
Financing Obligation [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 6.09%    
Debt Instrument, Maturity Date Sep. 30, 2021    
Long-term Debt, Gross $ 244 275  
Capital Lease Obligations [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum 2.35%    
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 10.52%    
Maturity Date Range, Start Dec. 30, 2015    
Maturity Date Range, End Nov. 21, 2023    
Long-term Debt, Gross $ 173 $ 127  
Minimum [Member] | Line of Credit [Member] | Export Development Canada Agreement [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 3.78%    
Minimum [Member] | Line of Credit [Member] | Secured Equipment Credit Facility [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.99%    
Maximum [Member] | Line of Credit [Member] | Export Development Canada Agreement [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 4.08%    
Maximum [Member] | Line of Credit [Member] | Secured Equipment Credit Facility [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 2.39%    
[1] Notes of Clearwire Communications LLC are also direct obligations of Clearwire Finance, Inc. and are guaranteed by certain Clearwire subsidiaries.