Revenue Recognition - Revenue by Segment, Sales Channel and Product Category (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Total Revenue	$ 3,092	$ 3,268	$ 6,274	$ 6,558
Adjustments for Non-ASC 606 Revenue	(223)	(250)	(494)	(479)
Total revenue from Contracts with Customers	2,869	3,018	5,780	6,079
Business
Disaggregation of Revenue [Line Items]
Total Revenue	2,490	2,578	5,014	5,169
Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	602	690	1,260	1,389
Operating Segments | Business
Disaggregation of Revenue [Line Items]
Total Revenue	2,490	2,578	5,014	5,169
Adjustments for Non-ASC 606 Revenue	(236)	(211)	(471)	(399)
Total revenue from Contracts with Customers	2,254	2,367	4,543	4,770
Operating Segments | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	602	690	1,260	1,389
Adjustments for Non-ASC 606 Revenue	13	(39)	(23)	(80)
Total revenue from Contracts with Customers	615	651	1,237	1,309
Operating Segments | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	732	749	1,469	1,514
Adjustments for Non-ASC 606 Revenue	(91)	(61)	(178)	(111)
Total revenue from Contracts with Customers	641	688	1,291	1,403
Operating Segments | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	500	562	1,013	1,139
Adjustments for Non-ASC 606 Revenue	(6)	(8)	(14)	(16)
Total revenue from Contracts with Customers	494	554	999	1,123
Operating Segments | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	486	449	969	870
Adjustments for Non-ASC 606 Revenue	(24)	(21)	(48)	(43)
Total revenue from Contracts with Customers	462	428	921	827
Operating Segments | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	690	726	1,395	1,457
Adjustments for Non-ASC 606 Revenue	(114)	(120)	(229)	(227)
Total revenue from Contracts with Customers	576	606	1,166	1,230
Operating Segments | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	82	92	168	189
Adjustments for Non-ASC 606 Revenue	(1)	(1)	(2)	(2)
Total revenue from Contracts with Customers	81	91	166	187
Operating Segments | Grow | Business
Disaggregation of Revenue [Line Items]
Total Revenue	1,127	1,063	2,263	2,122
Adjustments for Non-ASC 606 Revenue	(190)	(165)	(384)	(304)
Total revenue from Contracts with Customers	937	898	1,879	1,818
Operating Segments | Grow | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	427	377	843	755
Adjustments for Non-ASC 606 Revenue	(91)	(61)	(178)	(110)
Total revenue from Contracts with Customers	336	316	665	645
Operating Segments | Grow | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	260	257	519	513
Adjustments for Non-ASC 606 Revenue	(5)	(7)	(12)	(13)
Total revenue from Contracts with Customers	255	250	507	500
Operating Segments | Grow | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	140	128	299	253
Adjustments for Non-ASC 606 Revenue	(24)	(20)	(48)	(41)
Total revenue from Contracts with Customers	116	108	251	212
Operating Segments | Grow | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	262	263	527	523
Adjustments for Non-ASC 606 Revenue	(69)	(76)	(144)	(138)
Total revenue from Contracts with Customers	193	187	383	385
Operating Segments | Grow | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	38	38	75	78
Adjustments for Non-ASC 606 Revenue	(1)	(1)	(2)	(2)
Total revenue from Contracts with Customers	37	37	73	76
Operating Segments | Nurture | Business
Disaggregation of Revenue [Line Items]
Total Revenue	634	750	1,300	1,526
Adjustments for Non-ASC 606 Revenue	(6)	(7)	(12)	(14)
Total revenue from Contracts with Customers	628	743	1,288	1,512
Operating Segments | Nurture | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	192	235	395	476
Adjustments for Non-ASC 606 Revenue	0	0	0	0
Total revenue from Contracts with Customers	192	235	395	476
Operating Segments | Nurture | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	154	200	319	413
Adjustments for Non-ASC 606 Revenue	0	0	0	0
Total revenue from Contracts with Customers	154	200	319	413
Operating Segments | Nurture | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	83	88	167	176
Adjustments for Non-ASC 606 Revenue	0	0	0	0
Total revenue from Contracts with Customers	83	88	167	176
Operating Segments | Nurture | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	170	186	347	378
Adjustments for Non-ASC 606 Revenue	(6)	(7)	(12)	(14)
Total revenue from Contracts with Customers	164	179	335	364
Operating Segments | Nurture | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	35	41	72	83
Adjustments for Non-ASC 606 Revenue	0	0	0	0
Total revenue from Contracts with Customers	35	41	72	83
Operating Segments | Harvest | Business
Disaggregation of Revenue [Line Items]
Total Revenue	554	568	1,088	1,150
Adjustments for Non-ASC 606 Revenue	(40)	(39)	(75)	(79)
Total revenue from Contracts with Customers	514	529	1,013	1,071
Operating Segments | Harvest | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	75	96	154	199
Adjustments for Non-ASC 606 Revenue	0	0	0	0
Total revenue from Contracts with Customers	75	96	154	199
Operating Segments | Harvest | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	77	95	156	193
Adjustments for Non-ASC 606 Revenue	(1)	(1)	(2)	(2)
Total revenue from Contracts with Customers	76	94	154	191
Operating Segments | Harvest | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	137	92	245	186
Adjustments for Non-ASC 606 Revenue	0	(1)	0	(2)
Total revenue from Contracts with Customers	137	91	245	184
Operating Segments | Harvest | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	258	275	518	551
Adjustments for Non-ASC 606 Revenue	(39)	(37)	(73)	(75)
Total revenue from Contracts with Customers	219	238	445	476
Operating Segments | Harvest | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	7	10	15	21
Adjustments for Non-ASC 606 Revenue	0	0	0	0
Total revenue from Contracts with Customers	7	10	15	21
Operating Segments | Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	175	197	363	371
Adjustments for Non-ASC 606 Revenue	0	0	0	(2)
Total revenue from Contracts with Customers	175	197	363	369
Operating Segments | Other | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	38	41	77	84
Adjustments for Non-ASC 606 Revenue	0	0	0	(1)
Total revenue from Contracts with Customers	38	41	77	83
Operating Segments | Other | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	9	10	19	20
Adjustments for Non-ASC 606 Revenue	0	0	0	(1)
Total revenue from Contracts with Customers	9	10	19	19
Operating Segments | Other | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	126	141	258	255
Adjustments for Non-ASC 606 Revenue	0	0	0	0
Total revenue from Contracts with Customers	126	141	258	255
Operating Segments | Other | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	0	2	3	5
Adjustments for Non-ASC 606 Revenue	0	0	0	0
Total revenue from Contracts with Customers	0	2	3	5
Operating Segments | Other | International and Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	2	3	6	7
Adjustments for Non-ASC 606 Revenue	0	0	0	0
Total revenue from Contracts with Customers	2	3	6	7
Operating Segments | Fiber Broadband | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	217	181	426	351
Adjustments for Non-ASC 606 Revenue	(3)	(3)	(6)	(7)
Total revenue from Contracts with Customers	214	178	420	344
Operating Segments | Other Broadband | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	245	298	502	613
Adjustments for Non-ASC 606 Revenue	(24)	(27)	(48)	(55)
Total revenue from Contracts with Customers	221	271	454	558
Operating Segments | Voice and Other | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	140	211	332	425
Adjustments for Non-ASC 606 Revenue	40	(9)	31	(18)
Total revenue from Contracts with Customers	$ 180	$ 202	$ 363	$ 407