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Acquisitions and Divestitures - Spectrum License Transactions (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Feb. 28, 2021	Mar. 31, 2021	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Payments for intangible assets				$ 5,796	$ 3,653	$ 47,596
Spectrum Licenses, C-Band | Spectrum Licenses
Business Acquisition [Line Items]
Payments for intangible assets		$ 44,600				45,500
Estimated clearing and incentive costs	$ 7,600
Spectrum Licenses, C-Band | Spectrum Licenses | Satellite Agreements
Business Acquisition [Line Items]
Payments for intangible assets					310
Costs incurred for license agreements acquired					340
Spectrum Licenses, C-Band | Spectrum Licenses | Scenario, Forecast
Business Acquisition [Line Items]
Estimated clearing and incentive costs			$ 400
Spectrum Licenses, C-Band | Spectrum Licenses | Projected Clearing Costs
Business Acquisition [Line Items]
Payments for intangible assets				$ 4,300	$ 1,600	$ 1,300

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