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 revenues	$ 1,819	$ 1,990	$ 5,718	$ 5,964
Adjustments for non-ASC 606 revenue	(214)	(241)	(700)	(719)
Total revenue from contracts with customers	1,605	1,749	5,018	5,245
Compute and Application Services
Disaggregation of Revenue [Line Items]
Total revenues	235	287	795	850
Adjustments for non-ASC 606 revenue	(100)	(126)	(354)	(380)
Total revenue from contracts with customers	135	161	441	470
IP and Data Services
Disaggregation of Revenue [Line Items]
Total revenues	831	890	2,600	2,659
Adjustments for non-ASC 606 revenue	0	0	0	0
Total revenue from contracts with customers	831	890	2,600	2,659
Fiber Infrastructure Services
Disaggregation of Revenue [Line Items]
Total revenues	381	412	1,175	1,210
Adjustments for non-ASC 606 revenue	(54)	(56)	(165)	(164)
Total revenue from contracts with customers	327	356	1,010	1,046
Voice and Other
Disaggregation of Revenue [Line Items]
Total revenues	315	345	978	1,078
Adjustments for non-ASC 606 revenue	(3)	(3)	(11)	(8)
Total revenue from contracts with customers	312	342	967	1,070
Affiliate Services
Disaggregation of Revenue [Line Items]
Total revenues	57	56	170	167
Adjustments for non-ASC 606 revenue	(57)	(56)	(170)	(167)
Total revenue from contracts with customers	$ 0	$ 0	$ 0	$ 0