Revenue Recognition - Revenue by Segment, Sales Channel and Product Category (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenue	$ 4,676	$ 5,029
Operating Segments
Disaggregation of Revenue [Line Items]
Total revenue	4,676	5,029
Adjustments for non-ASC 606 revenue	(415)	(474)
Total revenue from contracts with customers	4,261	4,555
Operating Segments | Business
Disaggregation of Revenue [Line Items]
Total revenue	3,401	3,595
Adjustments for non-ASC 606 revenue	(275)	(274)
Total revenue from contracts with customers	3,126	3,321
Operating Segments | Business | Compute and Application Services
Disaggregation of Revenue [Line Items]
Total revenue	427	431
Adjustments for non-ASC 606 revenue	(134)	(132)
Total revenue from contracts with customers	293	299
Operating Segments | Business | IP and Data Services
Disaggregation of Revenue [Line Items]
Total revenue	1,522	1,578
Adjustments for non-ASC 606 revenue	(1)	(1)
Total revenue from contracts with customers	1,521	1,577
Operating Segments | Business | Fiber Infrastructure
Disaggregation of Revenue [Line Items]
Total revenue	535	557
Adjustments for non-ASC 606 revenue	(76)	(78)
Total revenue from contracts with customers	459	479
Operating Segments | Business | Voice and Other
Disaggregation of Revenue [Line Items]
Total revenue	917	1,029
Adjustments for non-ASC 606 revenue	(64)	(63)
Total revenue from contracts with customers	853	966
Operating Segments | Business | International and Global Accounts ("IGAM")
Disaggregation of Revenue [Line Items]
Total revenue	999	1,020
Adjustments for non-ASC 606 revenue	(107)	(99)
Total revenue from contracts with customers	892	921
Operating Segments | Business | International and Global Accounts ("IGAM") | Compute and Application Services
Disaggregation of Revenue [Line Items]
Total revenue	183	183
Adjustments for non-ASC 606 revenue	(73)	(69)
Total revenue from contracts with customers	110	114
Operating Segments | Business | International and Global Accounts ("IGAM") | IP and Data Services
Disaggregation of Revenue [Line Items]
Total revenue	423	429
Adjustments for non-ASC 606 revenue	0	0
Total revenue from contracts with customers	423	429
Operating Segments | Business | International and Global Accounts ("IGAM") | Fiber Infrastructure
Disaggregation of Revenue [Line Items]
Total revenue	219	217
Adjustments for non-ASC 606 revenue	(34)	(30)
Total revenue from contracts with customers	185	187
Operating Segments | Business | International and Global Accounts ("IGAM") | Voice and Other
Disaggregation of Revenue [Line Items]
Total revenue	174	191
Adjustments for non-ASC 606 revenue	0	0
Total revenue from contracts with customers	174	191
Operating Segments | Business | Large Enterprise
Disaggregation of Revenue [Line Items]
Total revenue	877	953
Adjustments for non-ASC 606 revenue	(27)	(30)
Total revenue from contracts with customers	850	923
Operating Segments | Business | Large Enterprise | Compute and Application Services
Disaggregation of Revenue [Line Items]
Total revenue	163	169
Adjustments for non-ASC 606 revenue	(14)	(15)
Total revenue from contracts with customers	149	154
Operating Segments | Business | Large Enterprise | IP and Data Services
Disaggregation of Revenue [Line Items]
Total revenue	388	402
Adjustments for non-ASC 606 revenue	0	0
Total revenue from contracts with customers	388	402
Operating Segments | Business | Large Enterprise | Fiber Infrastructure
Disaggregation of Revenue [Line Items]
Total revenue	113	130
Adjustments for non-ASC 606 revenue	(13)	(15)
Total revenue from contracts with customers	100	115
Operating Segments | Business | Large Enterprise | Voice and Other
Disaggregation of Revenue [Line Items]
Total revenue	213	252
Adjustments for non-ASC 606 revenue	0	0
Total revenue from contracts with customers	213	252
Operating Segments | Business | Mid-Market Enterprise
Disaggregation of Revenue [Line Items]
Total revenue	636	693
Adjustments for non-ASC 606 revenue	(10)	(11)
Total revenue from contracts with customers	626	682
Operating Segments | Business | Mid-Market Enterprise | Compute and Application Services
Disaggregation of Revenue [Line Items]
Total revenue	33	32
Adjustments for non-ASC 606 revenue	(7)	(8)
Total revenue from contracts with customers	26	24
Operating Segments | Business | Mid-Market Enterprise | IP and Data Services
Disaggregation of Revenue [Line Items]
Total revenue	415	442
Adjustments for non-ASC 606 revenue	(1)	(1)
Total revenue from contracts with customers	414	441
Operating Segments | Business | Mid-Market Enterprise | Fiber Infrastructure
Disaggregation of Revenue [Line Items]
Total revenue	49	56
Adjustments for non-ASC 606 revenue	(2)	(2)
Total revenue from contracts with customers	47	54
Operating Segments | Business | Mid-Market Enterprise | Voice and Other
Disaggregation of Revenue [Line Items]
Total revenue	139	163
Adjustments for non-ASC 606 revenue	0	0
Total revenue from contracts with customers	139	163
Operating Segments | Business | Wholesale
Disaggregation of Revenue [Line Items]
Total revenue	889	929
Adjustments for non-ASC 606 revenue	(131)	(134)
Total revenue from contracts with customers	758	795
Operating Segments | Business | Wholesale | Compute and Application Services
Disaggregation of Revenue [Line Items]
Total revenue	48	47
Adjustments for non-ASC 606 revenue	(40)	(40)
Total revenue from contracts with customers	8	7
Operating Segments | Business | Wholesale | IP and Data Services
Disaggregation of Revenue [Line Items]
Total revenue	296	305
Adjustments for non-ASC 606 revenue	0	0
Total revenue from contracts with customers	296	305
Operating Segments | Business | Wholesale | Fiber Infrastructure
Disaggregation of Revenue [Line Items]
Total revenue	154	154
Adjustments for non-ASC 606 revenue	(27)	(31)
Total revenue from contracts with customers	127	123
Operating Segments | Business | Wholesale | Voice and Other
Disaggregation of Revenue [Line Items]
Total revenue	391	423
Adjustments for non-ASC 606 revenue	(64)	(63)
Total revenue from contracts with customers	327	360
Operating Segments | Mass Markets
Disaggregation of Revenue [Line Items]
Total revenue	1,275	1,434
Adjustments for non-ASC 606 revenue	(140)	(200)
Total revenue from contracts with customers	1,135	1,234
Operating Segments | Mass Markets | Fiber Broadband
Disaggregation of Revenue [Line Items]
Total revenue	145	122
Adjustments for non-ASC 606 revenue	(5)	0
Total revenue from contracts with customers	140	122
Operating Segments | Mass Markets | Other Broadband
Disaggregation of Revenue [Line Items]
Total revenue	610	648
Adjustments for non-ASC 606 revenue	(56)	(55)
Total revenue from contracts with customers	554	593
Operating Segments | Mass Markets | Voice and Other
Disaggregation of Revenue [Line Items]
Total revenue	520	664
Adjustments for non-ASC 606 revenue	(79)	(145)
Total revenue from contracts with customers	$ 441	$ 519