Acquisitions, Dispositions And Other Adjustments (Spectrum Auctions Narrative) (Details) $ in Millions		1 Months Ended		3 Months Ended			12 Months Ended
	Jan. 14, 2022 license	Dec. 31, 2021 USD ($)	Feb. 28, 2021 license	Mar. 31, 2022 USD ($)	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
3.45 GHz Licenses
Indefinite-lived Intangible Assets [Line Items]
Winning bidder, number of licenses | license	1,624
Payments to acquire intangible assets				$ 8,956	$ 123				$ 9,079
C-Band Licenses
Indefinite-lived Intangible Assets [Line Items]
Winning bidder, number of licenses | license			1,621
Payments to acquire intangible assets						$ 22,856				$ 23,406	$ 550
Estimated relocation costs									1,100
Intangible Asset Acquisition, Satellite Relocation Cost							$ 138	$ 109	$ 98	$ 650
Phase I Spectrum
Indefinite-lived Intangible Assets [Line Items]
Estimated Incentive Payments upon clearing of spectrum		$ 955
Phase II Spectrum
Indefinite-lived Intangible Assets [Line Items]
Estimated Incentive Payments upon clearing of spectrum								$ 2,112