Acquisitions and Divestitures - Spectrum License Transactions (Details) $ in Millions	1 Months Ended		3 Months Ended	12 Months Ended			24 Months Ended
	Feb. 28, 2021 USD ($)	Mar. 31, 2020 USD ($) license	Mar. 31, 2021 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2024 USD ($)
Business Acquisition [Line Items]
Payments for intangible assets				$ 3,653	$ 47,596	$ 3,896
Loss on disposition of licenses, pre-tax				0	223	1,195
Spectrum Licenses
Business Acquisition [Line Items]
Number of licenses acquired | license		4,940
Business acquisition consideration		$ 3,400
Portion of price settled		1,800
Loss on disposition of licenses, pre-tax						1,200
Loss on disposition of licenses						$ 914
Spectrum Licenses
Business Acquisition [Line Items]
Payments for intangible assets		$ 1,600
Spectrum Licenses | Various Other Wireless Licenses
Business Acquisition [Line Items]
Payments for intangible assets					95
Loss on disposition of licenses, pre-tax					223
Loss on disposition of licenses					167
Spectrum Licenses, C-Band | Spectrum Licenses
Business Acquisition [Line Items]
Payments for intangible assets			$ 44,600		45,500
Estimated clearing and incentive costs	$ 7,700
Costs incurred for license agreements acquired				340
Spectrum Licenses, C-Band | Spectrum Licenses | Satellite Agreements
Business Acquisition [Line Items]
Payments for intangible assets				310
Spectrum Licenses, C-Band | Spectrum Licenses | Scenario, Forecast
Business Acquisition [Line Items]
Estimated clearing and incentive costs							$ 4,800
Spectrum Licenses, C-Band | Spectrum Licenses | Projected Clearing Costs
Business Acquisition [Line Items]
Payments for intangible assets				$ 1,600	1,300
Accrued clearing incentives and clearing costs					$ 1,400