v3.21.2
Tower Obligations - Sale Leaseback Transaction (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Property and equipment, net    
Sale Leaseback Transaction [Line Items]    
Sale-leasebacks $ 2,634 $ 2,838
Tower obligations    
Sale Leaseback Transaction [Line Items]    
Sale-leasebacks 2,919 3,028
Other long-term liabilities    
Sale Leaseback Transaction [Line Items]    
Sale-leasebacks $ 1,712 $ 1,712