Property, Plant And Equipment (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Depreciation expense		$ (17,852)	$ (17,634)	$ (19,028)
Diluted earnings per share (in dollars per share)		$ (1.13)	$ 2.73	$ (0.75)
Video | Communications
Property, Plant and Equipment [Line Items]
Impairment charge recorded	$ 7,255
Video | Communications | Property, Plant and Equipment
Property, Plant and Equipment [Line Items]
Impairment charge recorded	$ 1,681
Copper Network Assets
Property, Plant and Equipment [Line Items]
Noncash pre-tax charge to abandon copper assets		$ 1,413
Software
Property, Plant and Equipment [Line Items]
Depreciation expense		(2,972)	$ (2,909)	$ (3,343)
Service Life [Member] | Fiber
Property, Plant and Equipment [Line Items]
Depreciation expense		$ 280
Diluted earnings per share (in dollars per share)		$ 0.03