Acquisitions, Dispositions And Other Adjustments (Spectrum Auctions Narrative) (Details) $ in Millions		1 Months Ended		3 Months Ended							6 Months Ended	12 Months Ended
	Jan. 14, 2022 license	Dec. 31, 2021 USD ($)	Feb. 28, 2021 license	Sep. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Licensing Agreements
Indefinite-lived Intangible Assets [Line Items]
Payments to acquire intangible assets											$ 1,186
39 GHz Licenses
Indefinite-lived Intangible Assets [Line Items]
Payments to acquire intangible assets									$ 949
Value of consideration received in a noncash transaction											2,379
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				$ 98		$ 650
Phase I Spectrum
Indefinite-lived Intangible Assets [Line Items]
Estimated Incentive Payments upon clearing of spectrum		$ 955
Phase II Spectrum | Forecast
Indefinite-lived Intangible Assets [Line Items]
Estimated Incentive Payments upon clearing of spectrum												$ 2,112
FiberTower Corporation | 39 GHz Licenses
Indefinite-lived Intangible Assets [Line Items]
Book value of indefinite-lived intangible assets										$ 300
Gain on disposition of intangible asset										$ 900
Value of consideration received in a noncash transaction											$ 1,200