Revenue Recognition - Revenue by Segment, Sales Channel and Product Category (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Total Revenue	$ 3,182	$ 3,290
Adjustments for Non-ASC 606 Revenue	(271)	(229)
Total revenue from Contracts with Customers	2,911	3,061
Business
Disaggregation of Revenue [Line Items]
Total Revenue	2,524	2,591
Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	658	699
Operating Segments | Business
Disaggregation of Revenue [Line Items]
Total Revenue	2,524	2,591
Adjustments for Non-ASC 606 Revenue	(235)	(188)
Total revenue from Contracts with Customers	2,289	2,403
Operating Segments | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	658	699
Adjustments for Non-ASC 606 Revenue	(36)	(41)
Total revenue from Contracts with Customers	622	658
Operating Segments | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	737	765
Adjustments for Non-ASC 606 Revenue	(87)	(50)
Total revenue from Contracts with Customers	650	715
Operating Segments | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	513	577
Adjustments for Non-ASC 606 Revenue	(8)	(8)
Total revenue from Contracts with Customers	505	569
Operating Segments | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	483	421
Adjustments for Non-ASC 606 Revenue	(24)	(22)
Total revenue from Contracts with Customers	459	399
Operating Segments | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	705	731
Adjustments for Non-ASC 606 Revenue	(115)	(107)
Total revenue from Contracts with Customers	590	624
Operating Segments | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	86	97
Adjustments for Non-ASC 606 Revenue	(1)	(1)
Total revenue from Contracts with Customers	85	96
Operating Segments | Grow | Business
Disaggregation of Revenue [Line Items]
Total Revenue	1,136	1,059
Adjustments for Non-ASC 606 Revenue	(194)	(139)
Total revenue from Contracts with Customers	942	920
Operating Segments | Grow | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	416	378
Adjustments for Non-ASC 606 Revenue	(87)	(49)
Total revenue from Contracts with Customers	329	329
Operating Segments | Grow | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	259	256
Adjustments for Non-ASC 606 Revenue	(7)	(6)
Total revenue from Contracts with Customers	252	250
Operating Segments | Grow | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	159	125
Adjustments for Non-ASC 606 Revenue	(24)	(21)
Total revenue from Contracts with Customers	135	104
Operating Segments | Grow | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	265	260
Adjustments for Non-ASC 606 Revenue	(75)	(62)
Total revenue from Contracts with Customers	190	198
Operating Segments | Grow | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	37	40
Adjustments for Non-ASC 606 Revenue	(1)	(1)
Total revenue from Contracts with Customers	36	39
Operating Segments | Nurture | Business
Disaggregation of Revenue [Line Items]
Total Revenue	666	776
Adjustments for Non-ASC 606 Revenue	(6)	(7)
Total revenue from Contracts with Customers	660	769
Operating Segments | Nurture | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	203	241
Adjustments for Non-ASC 606 Revenue	0	0
Total revenue from Contracts with Customers	203	241
Operating Segments | Nurture | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	165	213
Adjustments for Non-ASC 606 Revenue	0	0
Total revenue from Contracts with Customers	165	213
Operating Segments | Nurture | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	84	88
Adjustments for Non-ASC 606 Revenue	0	0
Total revenue from Contracts with Customers	84	88
Operating Segments | Nurture | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	177	192
Adjustments for Non-ASC 606 Revenue	(6)	(7)
Total revenue from Contracts with Customers	171	185
Operating Segments | Nurture | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	37	42
Adjustments for Non-ASC 606 Revenue	0	0
Total revenue from Contracts with Customers	37	42
Operating Segments | Harvest | Business
Disaggregation of Revenue [Line Items]
Total Revenue	534	582
Adjustments for Non-ASC 606 Revenue	(35)	(40)
Total revenue from Contracts with Customers	499	542
Operating Segments | Harvest | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	79	103
Adjustments for Non-ASC 606 Revenue	0	0
Total revenue from Contracts with Customers	79	103
Operating Segments | Harvest | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	79	98
Adjustments for Non-ASC 606 Revenue	(1)	(1)
Total revenue from Contracts with Customers	78	97
Operating Segments | Harvest | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	108	94
Adjustments for Non-ASC 606 Revenue	0	(1)
Total revenue from Contracts with Customers	108	93
Operating Segments | Harvest | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	260	276
Adjustments for Non-ASC 606 Revenue	(34)	(38)
Total revenue from Contracts with Customers	226	238
Operating Segments | Harvest | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	8	11
Adjustments for Non-ASC 606 Revenue	0	0
Total revenue from Contracts with Customers	8	11
Operating Segments | Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	188	174
Adjustments for Non-ASC 606 Revenue	0	(2)
Total revenue from Contracts with Customers	188	172
Operating Segments | Other | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	39	43
Adjustments for Non-ASC 606 Revenue	0	(1)
Total revenue from Contracts with Customers	39	42
Operating Segments | Other | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	10	10
Adjustments for Non-ASC 606 Revenue	0	(1)
Total revenue from Contracts with Customers	10	9
Operating Segments | Other | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	132	114
Adjustments for Non-ASC 606 Revenue	0	0
Total revenue from Contracts with Customers	132	114
Operating Segments | Other | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	3	3
Adjustments for Non-ASC 606 Revenue	0	0
Total revenue from Contracts with Customers	3	3
Operating Segments | Other | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	4	4
Adjustments for Non-ASC 606 Revenue	0	0
Total revenue from Contracts with Customers	4	4
Operating Segments | Fiber Broadband | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	209	170
Adjustments for Non-ASC 606 Revenue	(3)	(4)
Total revenue from Contracts with Customers	206	166
Operating Segments | Other Broadband | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	257	315
Adjustments for Non-ASC 606 Revenue	(24)	(28)
Total revenue from Contracts with Customers	233	287
Operating Segments | Voice and Other | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	192	214
Adjustments for Non-ASC 606 Revenue	(9)	(9)
Total revenue from Contracts with Customers	$ 183	$ 205