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FirstNet (Narrative) (Details) - FirstNet - Licensing Agreements
$ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
milestone
Government Contracts Subject to Renegotiation [Line Items]  
Term of contract 25 years
Amount of success-based payments expected to be received $ 6,500
Period over which success-based payments are expected to be received, construction period 5 years
Sustainability payment commitment amount $ 18,000
Amount estimated to be reinvested into the network 15,000
Amount submitted in sustainability payments 195
Future sustainability payments due in 2023 195
Future sustainability payments due in 2024 195
Future sustainability payments due in 2025 195
Future sustainability payments due in 2026 1,590
Future sustainability payments due in 2027 1,665
Future sustainability payments due thereafter $ 13,365
Number of operating capability milestones | milestone 6
Refunds received under contract $ 6,120
Maximum  
Government Contracts Subject to Renegotiation [Line Items]  
Anticipated amount of operating expenses over life of contract, adjusted for inflation (or less) $ 3,000