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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jul. 29, 2015
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Commitments And Contingencies [Line Items]                        
Net lease and rental expense                   $ 60 $ 66 $ 82
Firm’s expected commitments                   288 318  
Other off-balance sheet commitments to investees   $ 2       $ 5       2 5  
Revenues   $ 841 $ 811 $ 745 $ 849 $ 750 $ 710 $ 677 $ 829 3,246 $ 2,966 $ 3,027
Sirius XM | Settled Litigation                        
Commitments And Contingencies [Line Items]                        
Receipts from plaintiff $ 210                      
Cash distribution                   33    
Revenues                   $ 28