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Acquisitions and Divestitures (Details) $ / shares in Units, $ in Millions			1 Months Ended	9 Months Ended
	Oct. 17, 2024 USD ($)	Sep. 04, 2024 USD ($) $ / shares	Feb. 28, 2021 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Mar. 31, 2026 market
Business Combination [Line Items]
Payments for deposits				$ 340	$ 768
Spectrum Licenses, United States Cellular Corporation (UScellular)
Business Combination [Line Items]
Asset acquisition, consideration transferred	$ 1,000
Spectrum licenses | Spectrum Licenses, C-Band
Business Combination [Line Items]
Estimated clearing and incentive costs			$ 7,500
Spectrum licenses | Spectrum Licenses, C-Band | Projected Clearing Costs
Business Combination [Line Items]
Payments for deposits					$ 269
Frontier
Business Combination [Line Items]
Business acquisition, share price (in dollars per share) | $ / shares		$ 38.50
Business combination, termination fee		$ 590
Frontier | Frontier
Business Combination [Line Items]
Business combination, termination fee		$ 320
Starry Group Holdings, Inc. | Scenario, Forecast
Business Combination [Line Items]
Number of markets serviced | market						5

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