Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Total Revenue	$ 1,618	$ 1,730	$ 4,906	$ 5,246
Adjustments for non-ASC 606 revenue	(90)	(122)	(286)	(359)
Total Revenue from Contracts with Customers	1,528	1,608	4,620	4,887
Fiber Infrastructure
Disaggregation of Revenue [Line Items]
Total Revenue	487	495	1,481	1,500
Adjustments for non-ASC 606 revenue	(33)	(30)	(100)	(90)
Total Revenue from Contracts with Customers	454	465	1,381	1,410
Voice and Other
Disaggregation of Revenue [Line Items]
Total Revenue	429	522	1,331	1,595
Adjustments for non-ASC 606 revenue	(46)	(83)	(152)	(251)
Total Revenue from Contracts with Customers	383	439	1,179	1,344
IP and Data Services
Disaggregation of Revenue [Line Items]
Total Revenue	108	118	336	357
Adjustments for non-ASC 606 revenue	0	0	0	0
Total Revenue from Contracts with Customers	108	118	336	357
Affiliate Services
Disaggregation of Revenue [Line Items]
Total Revenue	594	595	1,758	1,794
Adjustments for non-ASC 606 revenue	(11)	(9)	(34)	(18)
Total Revenue from Contracts with Customers	$ 583	$ 586	$ 1,724	$ 1,776