Revenue Recognition - Revenue by Segment, Sales Channel and Product Category (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total Revenue	$ 3,290	$ 3,738
Adjustments for non-ASC 606 revenue	(229)	(276)
Total revenue from Contracts with Customers	3,061	3,462
Business
Disaggregation of Revenue [Line Items]
Total Revenue	2,591	2,968
Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	699	770
Operating Segments | Business
Disaggregation of Revenue [Line Items]
Total Revenue	2,591	2,968
Adjustments for non-ASC 606 revenue	(188)	(230)
Total revenue from Contracts with Customers	2,403	2,738
Operating Segments | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	699	770
Adjustments for non-ASC 606 revenue	(41)	(46)
Total revenue from Contracts with Customers	658	724
Operating Segments | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	858	911
Adjustments for non-ASC 606 revenue	(50)	(51)
Total revenue from Contracts with Customers	808	860
Operating Segments | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	486	523
Adjustments for non-ASC 606 revenue	(8)	(10)
Total revenue from Contracts with Customers	478	513
Operating Segments | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	420	432
Adjustments for non-ASC 606 revenue	(22)	(19)
Total revenue from Contracts with Customers	398	413
Operating Segments | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	730	823
Adjustments for non-ASC 606 revenue	(107)	(121)
Total revenue from Contracts with Customers	623	702
Operating Segments | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	97	279
Adjustments for non-ASC 606 revenue	(1)	(29)
Total revenue from Contracts with Customers	96	250
Operating Segments | Grow | Business
Disaggregation of Revenue [Line Items]
Total Revenue	1,059	1,134
Adjustments for non-ASC 606 revenue	(139)	(176)
Total revenue from Contracts with Customers	920	958
Operating Segments | Grow | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	427	421
Adjustments for non-ASC 606 revenue	(49)	(50)
Total revenue from Contracts with Customers	378	371
Operating Segments | Grow | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	207	197
Adjustments for non-ASC 606 revenue	(6)	(7)
Total revenue from Contracts with Customers	201	190
Operating Segments | Grow | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	125	117
Adjustments for non-ASC 606 revenue	(21)	(19)
Total revenue from Contracts with Customers	104	98
Operating Segments | Grow | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	260	271
Adjustments for non-ASC 606 revenue	(62)	(71)
Total revenue from Contracts with Customers	198	200
Operating Segments | Grow | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	40	128
Adjustments for non-ASC 606 revenue	(1)	(29)
Total revenue from Contracts with Customers	39	99
Operating Segments | Nurture | Business
Disaggregation of Revenue [Line Items]
Total Revenue	777	913
Adjustments for non-ASC 606 revenue	(7)	(6)
Total revenue from Contracts with Customers	770	907
Operating Segments | Nurture | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	268	300
Adjustments for non-ASC 606 revenue	0	0
Total revenue from Contracts with Customers	268	300
Operating Segments | Nurture | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	188	219
Adjustments for non-ASC 606 revenue	0	0
Total revenue from Contracts with Customers	188	219
Operating Segments | Nurture | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	87	107
Adjustments for non-ASC 606 revenue	0	0
Total revenue from Contracts with Customers	87	107
Operating Segments | Nurture | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	192	215
Adjustments for non-ASC 606 revenue	(7)	(6)
Total revenue from Contracts with Customers	185	209
Operating Segments | Nurture | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	42	72
Adjustments for non-ASC 606 revenue	0	0
Total revenue from Contracts with Customers	42	72
Operating Segments | Harvest | Business
Disaggregation of Revenue [Line Items]
Total Revenue	582	706
Adjustments for non-ASC 606 revenue	(40)	(45)
Total revenue from Contracts with Customers	542	661
Operating Segments | Harvest | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	119	139
Adjustments for non-ASC 606 revenue	0	0
Total revenue from Contracts with Customers	119	139
Operating Segments | Harvest | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	83	98
Adjustments for non-ASC 606 revenue	(1)	(1)
Total revenue from Contracts with Customers	82	97
Operating Segments | Harvest | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	94	99
Adjustments for non-ASC 606 revenue	(1)	0
Total revenue from Contracts with Customers	93	99
Operating Segments | Harvest | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	275	332
Adjustments for non-ASC 606 revenue	(38)	(44)
Total revenue from Contracts with Customers	237	288
Operating Segments | Harvest | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	11	38
Adjustments for non-ASC 606 revenue	0	0
Total revenue from Contracts with Customers	11	38
Operating Segments | Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	173	215
Adjustments for non-ASC 606 revenue	(2)	(3)
Total revenue from Contracts with Customers	171	212
Operating Segments | Other | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	44	51
Adjustments for non-ASC 606 revenue	(1)	(1)
Total revenue from Contracts with Customers	43	50
Operating Segments | Other | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	8	9
Adjustments for non-ASC 606 revenue	(1)	(2)
Total revenue from Contracts with Customers	7	7
Operating Segments | Other | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	114	109
Adjustments for non-ASC 606 revenue	0	0
Total revenue from Contracts with Customers	114	109
Operating Segments | Other | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	3	5
Adjustments for non-ASC 606 revenue	0	0
Total revenue from Contracts with Customers	3	5
Operating Segments | Other | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	4	41
Adjustments for non-ASC 606 revenue	0	0
Total revenue from Contracts with Customers	4	41
Operating Segments | Fiber Broadband | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	170	152
Adjustments for non-ASC 606 revenue	(4)	(4)
Total revenue from Contracts with Customers	166	148
Operating Segments | Other Broadband | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	315	369
Adjustments for non-ASC 606 revenue	(28)	(33)
Total revenue from Contracts with Customers	287	336
Operating Segments | Voice and Other | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	214	249
Adjustments for non-ASC 606 revenue	(9)	(9)
Total revenue from Contracts with Customers	$ 205	$ 240