Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,946	$ 1,989
Adjustments for non-ASC 606 revenue	(242)	(237)
Total revenue from contracts with customers	1,704	1,752
Compute and Application Services
Disaggregation of Revenue [Line Items]
Total revenues	277	280
Adjustments for non-ASC 606 revenue	(128)	(127)
Total revenue from contracts with customers	149	153
IP and Data Services
Disaggregation of Revenue [Line Items]
Total revenues	886	881
Adjustments for non-ASC 606 revenue	0	0
Total revenue from contracts with customers	886	881
Fiber Infrastructure Services
Disaggregation of Revenue [Line Items]
Total revenues	391	397
Adjustments for non-ASC 606 revenue	(54)	(53)
Total revenue from contracts with customers	337	344
Voice and Other
Disaggregation of Revenue [Line Items]
Total revenues	336	376
Adjustments for non-ASC 606 revenue	(4)	(2)
Total revenue from contracts with customers	332	374
Affiliate Services
Disaggregation of Revenue [Line Items]
Total revenues	56	55
Adjustments for non-ASC 606 revenue	(56)	(55)
Total revenue from contracts with customers	$ 0	$ 0