Revenue Recognition - Schedule of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Total Revenue	$ 3,661	$ 4,612	$ 7,399	$ 9,288
Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenue	3,661	4,612	7,399	9,288
Adjustments for Non-ASC 606 revenue	(266)	(353)	(542)	(768)
Total revenue from Contracts with Customers	3,395	4,259	6,857	8,520
Operating Segments | Business
Disaggregation of Revenue [Line Items]
Total Revenue	2,897	3,417	5,853	6,818
Adjustments for Non-ASC 606 revenue	(221)	(273)	(451)	(548)
Total revenue from Contracts with Customers	2,676	3,144	5,402	6,270
Operating Segments | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	764	1,195	1,546	2,470
Adjustments for Non-ASC 606 revenue	(45)	(80)	(91)	(220)
Total revenue from Contracts with Customers	719	1,115	1,455	2,250
Operating Segments | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	1,179	1,432	2,373	2,874
Adjustments for Non-ASC 606 revenue	(79)	(103)	(159)	(208)
Total revenue from Contracts with Customers	1,100	1,329	2,214	2,666
Operating Segments | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	507	562	1,022	1,135
Adjustments for Non-ASC 606 revenue	(10)	(10)	(20)	(20)
Total revenue from Contracts with Customers	497	552	1,002	1,115
Operating Segments | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	414	494	844	973
Adjustments for Non-ASC 606 revenue	(19)	(29)	(38)	(57)
Total revenue from Contracts with Customers	395	465	806	916
Operating Segments | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	797	929	1,614	1,836
Adjustments for Non-ASC 606 revenue	(113)	(131)	(234)	(263)
Total revenue from Contracts with Customers	684	798	1,380	1,573
Operating Segments | Grow | Business
Disaggregation of Revenue [Line Items]
Total Revenue	1,138	1,202	2,266	2,388
Adjustments for Non-ASC 606 revenue	(167)	(205)	(343)	(410)
Total revenue from Contracts with Customers	971	997	1,923	1,978
Operating Segments | Grow | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	558	658	1,108	1,311
Adjustments for Non-ASC 606 revenue	(78)	(102)	(157)	(205)
Total revenue from Contracts with Customers	480	556	951	1,106
Operating Segments | Grow | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	202	188	398	373
Adjustments for Non-ASC 606 revenue	(8)	(8)	(15)	(16)
Total revenue from Contracts with Customers	194	180	383	357
Operating Segments | Grow | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	118	116	234	231
Adjustments for Non-ASC 606 revenue	(19)	(27)	(38)	(54)
Total revenue from Contracts with Customers	99	89	196	177
Operating Segments | Grow | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	260	240	526	473
Adjustments for Non-ASC 606 revenue	(62)	(68)	(133)	(135)
Total revenue from Contracts with Customers	198	172	393	338
Operating Segments | Nurture | Business
Disaggregation of Revenue [Line Items]
Total Revenue	869	1,061	1,774	2,154
Adjustments for Non-ASC 606 revenue	(8)	(7)	(14)	(14)
Total revenue from Contracts with Customers	861	1,054	1,760	2,140
Operating Segments | Nurture | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	369	444	744	898
Adjustments for Non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	369	444	744	898
Operating Segments | Nurture | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	202	231	413	472
Adjustments for Non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	202	231	413	472
Operating Segments | Nurture | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	93	128	199	259
Adjustments for Non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	93	128	199	259
Operating Segments | Nurture | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	205	258	418	525
Adjustments for Non-ASC 606 revenue	(8)	(7)	(14)	(14)
Total revenue from Contracts with Customers	197	251	404	511
Operating Segments | Harvest | Business
Disaggregation of Revenue [Line Items]
Total Revenue	717	936	1,456	1,883
Adjustments for Non-ASC 606 revenue	(44)	(59)	(89)	(120)
Total revenue from Contracts with Customers	673	877	1,367	1,763
Operating Segments | Harvest | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	197	272	404	548
Adjustments for Non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	197	272	404	548
Operating Segments | Harvest | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	94	135	194	275
Adjustments for Non-ASC 606 revenue	(1)	(2)	(2)	(4)
Total revenue from Contracts with Customers	93	133	192	271
Operating Segments | Harvest | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	95	124	194	248
Adjustments for Non-ASC 606 revenue	0	(1)	0	(2)
Total revenue from Contracts with Customers	95	123	194	246
Operating Segments | Harvest | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	331	405	664	812
Adjustments for Non-ASC 606 revenue	(43)	(56)	(87)	(114)
Total revenue from Contracts with Customers	288	349	577	698
Operating Segments | Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	173	218	357	393
Adjustments for Non-ASC 606 revenue	(2)	(2)	(5)	(4)
Total revenue from Contracts with Customers	171	216	352	389
Operating Segments | Other | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	55	58	117	117
Adjustments for Non-ASC 606 revenue	(1)	(1)	(2)	(3)
Total revenue from Contracts with Customers	54	57	115	114
Operating Segments | Other | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	9	8	17	15
Adjustments for Non-ASC 606 revenue	(1)	0	(3)	0
Total revenue from Contracts with Customers	8	8	14	15
Operating Segments | Other | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	108	126	217	235
Adjustments for Non-ASC 606 revenue	0	(1)	0	(1)
Total revenue from Contracts with Customers	108	125	217	234
Operating Segments | Other | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	1	26	6	26
Adjustments for Non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	1	26	6	26
Operating Segments | Fiber Broadband | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	157	151	309	296
Adjustments for Non-ASC 606 revenue	(4)	(5)	(8)	(10)
Total revenue from Contracts with Customers	153	146	301	286
Operating Segments | Other Broadband | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	355	597	724	1,207
Adjustments for Non-ASC 606 revenue	(32)	(55)	(65)	(111)
Total revenue from Contracts with Customers	323	542	659	1,096
Operating Segments | Voice and Other | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	252	447	513	967
Adjustments for Non-ASC 606 revenue	(9)	(20)	(18)	(99)
Total revenue from Contracts with Customers	$ 243	$ 427	$ 495	$ 868