Property, Plant And Equipment (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Proceeds from sale of property	$ 39	$ 2,843
Proceeds from sale and lease-back transactions		21	$ 70
Property, plant and equipment	15,714	15,714		$ 13,186
Capital expenditures		2,882	$ 1,860
Capital expenditures incurred but not yet paid		514
Accounts payable associated with capital	635	635
Capitalized interest		65
Towers [Member]
Property, Plant and Equipment [Line Items]
Proceeds from sale of property	34
Gain (Loss) on sale of property	21
Property, plant and equipment	13	13
Materials And Supplies [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 589	$ 589		$ 546