Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained (deficit) earnings	$ 19,415	$ (42,350)
Contract asset	5,512	4,389
Deferred income tax liability	57,032	53,767
Noncontrolling interest	8,957	17,523
Cash	866
Cash and cash equivalents	$ 3,701	$ 19,223	$ 7,924		$ 9,702
Estimated economic useful life	21 years 1 month 6 days
Wireless Licenses
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
FCC licenses - typical term (in years)	10 years
Estimated economic useful life	21 years 7 months 6 days
Money Market Funds and Other Cash Equivalents
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash equivalents	$ 2,835
Foreign Jurisdictions
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents	$ 1,045
Minimum | Software
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization period for capitalized software costs	3 years
Maximum | Software
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Amortization period for capitalized software costs	7 years
Mexico Segment [Member] | Wireless Licenses
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated economic useful life	25 years
ASU 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained (deficit) earnings				$ 293
Allowance for credit loss				395
Contract asset				(10)
Deferred income tax liability				(105)
Noncontrolling interest				$ (7)