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Related Party Transactions (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2015
Mar. 31, 2014
Jul. 09, 2013
Mar. 31, 2013
Jul. 10, 2013
Jul. 09, 2013
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2013
Oct. 31, 2014
Jul. 08, 2013
Related Party Transaction [Line Items]                      
Proceeds from sale-leaseback transaction $ 1,100     $ 0 $ 0            
Impairments             $ 166        
Related Party Transaction, Expenses from Transactions with Related Party             102 $ 66      
Clearwire [Member]                      
Related Party Transaction [Line Items]                      
Equity method investments                     $ 325
Predecessor [Member]                      
Related Party Transaction [Line Items]                      
Equity in losses of unconsolidated investments, net     $ (482) (202) (482)            
Derivative instruments not designated as hedging instruments, gain (loss), net     65                
Impairments       0 0            
Gain on previously-held equity interests       0 $ 2,926            
Related party transaction, amounts of transaction     $ 207 101              
Predecessor [Member] | Clearwire [Member]                      
Related Party Transaction [Line Items]                      
Gain on previously-held equity interests           $ 2,900          
Successor [Member]                      
Related Party Transaction [Line Items]                      
Proceeds from sale-leaseback transaction   $ 0   0     1,136 0 $ 0    
Equity in losses of unconsolidated investments, net   0   0     0 0 0    
Impairments   0   0     0 2,133 [1] 0    
Gain on previously-held equity interests   $ 0   $ 0     $ 0 $ 0 $ 0    
Non-Controlling Economic Interest [Member] | Clearwire Corporation [Member]                      
Related Party Transaction [Line Items]                      
Equity method investment, ownership percentage                     6.00%
Non-Controlling Economic Interest [Member] | Clearwire Communications LLC [Member]                      
Related Party Transaction [Line Items]                      
Equity method investment, ownership percentage                     44.10%
Clearwire Acquisition [Member] | Clearwire [Member]                      
Related Party Transaction [Line Items]                      
Business acquisition, share price     $ 5.00     $ 5.00          
Business acquisition, estimated control premium     $ 0.60     $ 0.60          
Clearwire Acquisition [Member] | Non-Controlling Economic Interest [Member]                      
Related Party Transaction [Line Items]                      
Equity method investment, ownership percentage                     50.10%
Line of Credit [Member] | Brightstar [Member]                      
Related Party Transaction [Line Items]                      
Line of credit facility, maximum borrowing capacity                   $ 1,000  
[1] (2)Impairments for the Successor year ended March 31, 2015 consist of a $1.9 billion trade name impairment related to the Wireless segment and a $233 million impairment related to Wireline long-lived assets.