Revenue Recognition - Revenue by Segment, Sales Channel and Product Category (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total Revenue	$ 3,268	$ 3,661	$ 6,558	$ 7,399
Adjustments for non-ASC 606 revenue	(250)	(266)	(479)	(542)
Total revenue from Contracts with Customers	3,018	3,395	6,079	6,857
Business
Disaggregation of Revenue [Line Items]
Total Revenue	2,577	2,908	5,168	5,876
Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	691	753	1,390	1,523
Operating Segments | Business
Disaggregation of Revenue [Line Items]
Total Revenue	2,577	2,908	5,168	5,876
Adjustments for non-ASC 606 revenue	(211)	(221)	(399)	(451)
Total revenue from Contracts with Customers	2,366	2,687	4,769	5,425
Operating Segments | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	691	753	1,390	1,523
Adjustments for non-ASC 606 revenue	(39)	(45)	(80)	(91)
Total revenue from Contracts with Customers	652	708	1,310	1,432
Operating Segments | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	837	899	1,695	1,810
Adjustments for non-ASC 606 revenue	(61)	(48)	(111)	(99)
Total revenue from Contracts with Customers	776	851	1,584	1,711
Operating Segments | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	478	514	964	1,037
Adjustments for non-ASC 606 revenue	(8)	(10)	(16)	(20)
Total revenue from Contracts with Customers	470	504	948	1,017
Operating Segments | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	448	415	868	847
Adjustments for non-ASC 606 revenue	(21)	(19)	(43)	(38)
Total revenue from Contracts with Customers	427	396	825	809
Operating Segments | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	723	803	1,453	1,626
Adjustments for non-ASC 606 revenue	(120)	(113)	(227)	(234)
Total revenue from Contracts with Customers	603	690	1,226	1,392
Operating Segments | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	91	277	188	556
Adjustments for non-ASC 606 revenue	(1)	(31)	(2)	(60)
Total revenue from Contracts with Customers	90	246	186	496
Operating Segments | Grow | Business
Disaggregation of Revenue [Line Items]
Total Revenue	1,063	1,144	2,122	2,278
Adjustments for non-ASC 606 revenue	(165)	(167)	(304)	(343)
Total revenue from Contracts with Customers	898	977	1,818	1,935
Operating Segments | Grow | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	424	428	851	849
Adjustments for non-ASC 606 revenue	(61)	(47)	(110)	(97)
Total revenue from Contracts with Customers	363	381	741	752
Operating Segments | Grow | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	210	203	417	400
Adjustments for non-ASC 606 revenue	(7)	(8)	(13)	(15)
Total revenue from Contracts with Customers	203	195	404	385
Operating Segments | Grow | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	127	119	252	236
Adjustments for non-ASC 606 revenue	(20)	(19)	(41)	(38)
Total revenue from Contracts with Customers	107	100	211	198
Operating Segments | Grow | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	264	265	524	536
Adjustments for non-ASC 606 revenue	(76)	(62)	(138)	(133)
Total revenue from Contracts with Customers	188	203	386	403
Operating Segments | Grow | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	38	129	78	257
Adjustments for non-ASC 606 revenue	(1)	(31)	(2)	(60)
Total revenue from Contracts with Customers	37	98	76	197
Operating Segments | Nurture | Business
Disaggregation of Revenue [Line Items]
Total Revenue	751	874	1,528	1,787
Adjustments for non-ASC 606 revenue	(7)	(8)	(14)	(14)
Total revenue from Contracts with Customers	744	866	1,514	1,773
Operating Segments | Nurture | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	258	293	526	593
Adjustments for non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	258	293	526	593
Operating Segments | Nurture | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	178	210	366	429
Adjustments for non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	178	210	366	429
Operating Segments | Nurture | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	88	93	175	200
Adjustments for non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	88	93	175	200
Operating Segments | Nurture | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	187	206	379	421
Adjustments for non-ASC 606 revenue	(7)	(8)	(14)	(14)
Total revenue from Contracts with Customers	180	198	365	407
Operating Segments | Nurture | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	40	72	82	144
Adjustments for non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	40	72	82	144
Operating Segments | Harvest | Business
Disaggregation of Revenue [Line Items]
Total Revenue	566	691	1,148	1,397
Adjustments for non-ASC 606 revenue	(39)	(44)	(79)	(89)
Total revenue from Contracts with Customers	527	647	1,069	1,308
Operating Segments | Harvest | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	112	133	231	272
Adjustments for non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	112	133	231	272
Operating Segments | Harvest | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	82	92	165	190
Adjustments for non-ASC 606 revenue	(1)	(1)	(2)	(2)
Total revenue from Contracts with Customers	81	91	163	188
Operating Segments | Harvest | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	92	95	186	194
Adjustments for non-ASC 606 revenue	(1)	0	(2)	0
Total revenue from Contracts with Customers	91	95	184	194
Operating Segments | Harvest | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	271	330	546	662
Adjustments for non-ASC 606 revenue	(37)	(43)	(75)	(87)
Total revenue from Contracts with Customers	234	287	471	575
Operating Segments | Harvest | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	9	41	20	79
Adjustments for non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	9	41	20	79
Operating Segments | Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	197	199	370	414
Adjustments for non-ASC 606 revenue	0	(2)	(2)	(5)
Total revenue from Contracts with Customers	197	197	368	409
Operating Segments | Other | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	43	45	87	96
Adjustments for non-ASC 606 revenue	0	(1)	(1)	(2)
Total revenue from Contracts with Customers	43	44	86	94
Operating Segments | Other | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	8	9	16	18
Adjustments for non-ASC 606 revenue	0	(1)	(1)	(3)
Total revenue from Contracts with Customers	8	8	15	15
Operating Segments | Other | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	141	108	255	217
Adjustments for non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	141	108	255	217
Operating Segments | Other | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	1	2	4	7
Adjustments for non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	1	2	4	7
Operating Segments | Other | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	4	35	8	76
Adjustments for non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	4	35	8	76
Operating Segments | Fiber Broadband | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	181	158	351	310
Adjustments for non-ASC 606 revenue	(3)	(4)	(7)	(8)
Total revenue from Contracts with Customers	178	154	344	302
Operating Segments | Other Broadband | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	298	355	613	724
Adjustments for non-ASC 606 revenue	(27)	(32)	(55)	(65)
Total revenue from Contracts with Customers	271	323	558	659
Operating Segments | Voice and Other | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	212	240	426	489
Adjustments for non-ASC 606 revenue	(9)	(9)	(18)	(18)
Total revenue from Contracts with Customers	$ 203	$ 231	$ 408	$ 471