v3.21.2
Goodwill, Spectrum License Transactions and Other Intangible Assets - Other Intangible Assets (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 6,627 $ 6,665
Accumulated Amortization (2,027) (1,367)
Net Amount 4,600 5,298
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
2022 1,095  
2023 903  
2024 746  
2025 588  
2026 428  
Thereafter 840  
Net Amount 4,600 5,298
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount 4,903 4,900
Accumulated Amortization (1,398) (865)
Net Amount 3,505 4,035
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
Net Amount $ 3,505 4,035
Customer relationships | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, useful life (in years) 8 years  
Tradenames and patents    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 606 598
Accumulated Amortization (486) (412)
Net Amount 120 186
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
Net Amount $ 120 186
Tradenames and patents | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, useful life (in years) 19 years  
Favorable spectrum leases    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 741 790
Accumulated Amortization (54) (35)
Net Amount 687 755
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
Net Amount $ 687 755
Favorable spectrum leases | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, useful life (in years) 27 years  
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Amount $ 377 377
Accumulated Amortization (89) (55)
Net Amount 288 322
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
Net Amount $ 288 $ 322
Other | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, useful life (in years) 10 years