v3.21.2
Tower Obligations - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 01, 2020
USD ($)
Mar. 31, 2020
USD ($)
tower_site
Jun. 30, 2021
USD ($)
tower_site
Dec. 31, 2012
USD ($)
tower_site
Sprint        
Sale Leaseback Transaction [Line Items]        
Property and equipment $ 18,435      
Adjustment, other long-term liabilities 1,700      
Crown Castle International Corp.        
Sale Leaseback Transaction [Line Items]        
Managed sites | tower_site     900  
Lease liabilities     $ 282  
Tower Transaction        
Sale Leaseback Transaction [Line Items]        
Lessee leasing arrangements, operating leases, term of contract (years)       10 years
Sale leaseback transaction, fixed-price purchase options       $ 2,000
Interest rate on tower obligations     6.00% 8.00%
Tower Transaction | Tower        
Sale Leaseback Transaction [Line Items]        
Useful life (in years)     20 years  
Tower Transaction | Crown Castle International Corp.        
Sale Leaseback Transaction [Line Items]        
Property subject to failed sale leaseback transaction, number of units | tower_site   6,400   6,200
Remaining term of lease   17 years    
Fixed-price purchase option on leased or subleased sites   $ 2,300    
Fixed-price purchase option on lease or subleased sites, exercisable period   1 year    
Days prior to expiration of agreement   120 days    
Initial term   10 years    
Property and equipment 2,800      
Tower obligations $ 1,100      
Tower Transaction | Minimum        
Sale Leaseback Transaction [Line Items]        
Lessee leasing arrangements, operating leases, term of contract (years)       23 years
Tower Transaction | Maximum        
Sale Leaseback Transaction [Line Items]        
Lessee leasing arrangements, operating leases, term of contract (years)       37 years