Property, Plant And Equipment (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2023	Apr. 30, 2021	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Proceeds from sale of property	$ 63			$ 3,148	$ 70
Proceeds from sale of certain properties subject to leaseback						$ 23
Proceeds from financing lease transactions			$ 23	30	70
Property, plant and equipment	16,324			16,324	13,186
Capital expenditures		$ 500	$ 1,205	3,211	2,738
Capital expenditures incurred but not yet paid					71
Accounts payable associated with capital	656			656
Vendor financing payables associated with capital expenditures				255
Capitalized interest				83
Land and Building [Member]
Property, Plant and Equipment [Line Items]
Proceeds from sale of property						15
Aggregate carrying value						14
Gain (Loss) on sale of property						$ (1)
Capital Leases [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	179			179	121
Towers [Member]
Property, Plant and Equipment [Line Items]
Proceeds from sale of property	47
Gain (Loss) on sale of property	28
Property, plant and equipment	19			19
Materials And Supplies [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 594			$ 594	546
Increase in property, plant and equipment					$ 400