Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total Revenue	$ 1,656	$ 1,792
Adjustments for non-ASC 606 revenue	(104)	(119)
Total Revenue from Contracts with Customers	1,552	1,673
Voice and Other [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	460	543
Adjustments for non-ASC 606 revenue	(59)	(85)
Total Revenue from Contracts with Customers	401	458
Fiber Infrastructure [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	498	504
Adjustments for non-ASC 606 revenue	(34)	(31)
Total Revenue from Contracts with Customers	464	473
IP & Data Services [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	117	123
Adjustments for non-ASC 606 revenue	0	0
Total Revenue from Contracts with Customers	117	123
Affiliate Services [Member]
Disaggregation of Revenue [Line Items]
Total Revenue	581	622
Adjustments for non-ASC 606 revenue	(11)	(3)
Total Revenue from Contracts with Customers	$ 570	$ 619