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Restructuring and Related Activities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ (48)	$ (72)	$ (104)	$ (72)
Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost Remaining					$ 10
2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	3	72	10	72
Payments for Restructuring	(4)	(36)	(23)	(36)
Restructuring Reserve, Settled without Cash	0	(5)	(4)	(5)
Restructuring Reserve	11	$ 31	11	$ 31		$ 18	$ 28
Employee headcount reduction		15.00%		15.00%
2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	51		94
Payments for Restructuring	(30)		(33)
Restructuring Reserve, Settled without Cash	3		9
Restructuring Reserve	$ 52		$ 52			34	0
Employee headcount reduction	10.00%		10.00%
Restructuring Plans | Towers [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 6		$ 13
Restructuring Plans | Fiber [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	30		60
Restructuring Plans | Other Segments
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	12		31
Employee Severance | 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	3	$ 62	1	$ 62
Payments for Restructuring	(1)	(35)	(13)	(35)
Restructuring Reserve, Settled without Cash	0	1	0	1
Restructuring Reserve	2	26	2	26		6	16
Employee Severance | 2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	1		35
Payments for Restructuring	(27)		(30)
Restructuring Reserve, Settled without Cash	3		4
Restructuring Reserve	9		9			34	0
Facility Closing | 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	0	10	11	10
Payments for Restructuring	(3)	(1)	(10)	(1)
Restructuring Reserve, Settled without Cash	0	4	4	4
Restructuring Reserve	9	$ 5	9	$ 5		12	12
Facility Closing | 2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	52		59
Payments for Restructuring	(3)		(3)
Restructuring Reserve, Settled without Cash	6		13
Restructuring Reserve	$ 43		$ 43			$ 0	$ 0

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