Goodwill And Other Intangible Assets (Summary Of Changes In Carrying Amount Of Goodwill, By Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Beginning balance - Net goodwill	$ 92,740	$ 92,812
Goodwill, Impairment Loss	(24,812)
Dispositions, currency exchange and other	(33)	(72)
Ending balance - Net goodwill	67,895	92,740
Communications
Goodwill [Roll Forward]
Beginning Balance - Goodwill	91,924	91,976
Beginning Balance - Impairments	0	0
Beginning balance - Net goodwill	91,924	91,976
Goodwill, Impairment Loss	(23,986)
Dispositions, currency exchange and other	(43)	(52)
Ending Balance - Goodwill	91,881	91,924
Ending Balance - Impairments	(23,986)	0
Ending balance - Net goodwill	67,895	91,924
Latin America Business Segment
Goodwill [Roll Forward]
Goodwill, Impairment Loss	(826)
Latin America Business Segment | Latin America
Goodwill [Roll Forward]
Beginning Balance - Goodwill	816	836
Goodwill, Impairment Loss	(826)
Dispositions, currency exchange and other	10	(20)
Ending Balance - Goodwill	0	816
Goodwill | Communications
Goodwill [Roll Forward]
Goodwill, Impairment Loss	(23,986)
Dispositions, currency exchange and other	$ (43)	$ (52)