Goodwill And Other Intangible Assets (Schedule Of Amortized Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life	21 years 1 month 6 days
Gross Carrying Amount	$ 3,788	$ 4,036
Accumulated Amortization	974	1,005
Currency Translation Adjustment	$ (378)	(545)
Wireless Licenses
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life	21 years 7 months 6 days
Gross Carrying Amount	$ 3,045	3,083
Accumulated Amortization	425	307
Currency Translation Adjustment	$ (297)	(440)
Trademarks and trade names
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life	15 years
Gross Carrying Amount	$ 26	27
Accumulated Amortization	11	11
Currency Translation Adjustment	$ (6)	(7)
Customer lists and relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life	12 years 7 months 6 days
Gross Carrying Amount	$ 413	577
Accumulated Amortization	304	429
Currency Translation Adjustment	$ (75)	(98)
Other
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life	8 years 6 months
Gross Carrying Amount	$ 304	349
Accumulated Amortization	234	258
Currency Translation Adjustment	$ 0	$ 0