Restructuring and Related Activities (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 109	$ 85	$ 0
Restructuring Reserve, Settled without Cash	(12)	(7)	0
2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	9	85
Payments for Restructuring	(26)	(50)
Restructuring Reserve, Settled without Cash	(4)	(7)
Restructuring Reserve	$ 7	28	0
Employee headcount reduction	15.00%
2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 100
Payments for Restructuring	(44)
Restructuring Reserve, Settled without Cash	(8)
Restructuring Reserve	$ 48	0
Employee headcount reduction	10.00%
Employee Severance [Member] \| 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 0	63
Payments for Restructuring	(14)	(46)
Restructuring Reserve, Settled without Cash	0	(1)
Restructuring Reserve	2	16	0
Employee Severance [Member] \| 2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	39
Payments for Restructuring	(34)
Restructuring Reserve, Settled without Cash	(4)
Restructuring Reserve	9	0
Facility Closing \| 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	9	22
Payments for Restructuring	(12)	(4)
Restructuring Reserve, Settled without Cash	(4)	(6)
Restructuring Reserve	5	12	$ 0
Facility Closing \| 2024 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	61
Payments for Restructuring	(10)
Restructuring Reserve, Settled without Cash	(12)
Restructuring Reserve	39	0
Towers [Member] \| Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	13	44
Fiber [Member] \| Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	64	18
Other Operating Segment \| Restructuring Plans
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 32	$ 23

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