Goodwill And Other Intangible Assets (Schedule Of Amortized Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life	21 years 7 months 6 days
Gross Carrying Amount	$ 3,391	$ 3,702
Accumulated Amortization	994	1,119
Currency Translation Adjustment	$ (423)	(56)
Wireless Licenses
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life	21 years 7 months 6 days
Gross Carrying Amount	$ 2,999	3,034
Accumulated Amortization	696	572
Currency Translation Adjustment	$ (343)	23
Customer lists and relationships
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life	10 years
Gross Carrying Amount	$ 349	379
Accumulated Amortization	275	286
Currency Translation Adjustment	$ (74)	(74)
Trademarks, trade names and other
Finite-Lived Intangible Assets [Line Items]
Weighted-Average Life	12 years 7 months 6 days
Gross Carrying Amount	$ 43	289
Accumulated Amortization	23	261
Currency Translation Adjustment	$ (6)	$ (5)