Revenue Recognition - Schedule of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total Revenue	$ 3,641	$ 4,390	$ 11,040	$ 13,678
Operating Segments
Disaggregation of Revenue [Line Items]
Total Revenue	3,641	4,390	11,040	13,678
Adjustments for Non-ASC 606 revenue	(262)	(331)	(804)	(1,099)
Total revenue from Contracts with Customers	3,379	4,059	10,236	12,579
Operating Segments | Business
Disaggregation of Revenue [Line Items]
Total Revenue	2,894	3,218	8,747	10,036
Adjustments for Non-ASC 606 revenue	(218)	(245)	(669)	(793)
Total revenue from Contracts with Customers	2,676	2,973	8,078	9,243
Operating Segments | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	747	1,172	2,293	3,642
Adjustments for Non-ASC 606 revenue	(44)	(86)	(135)	(306)
Total revenue from Contracts with Customers	703	1,086	2,158	3,336
Operating Segments | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	1,182	1,286	3,555	4,160
Adjustments for Non-ASC 606 revenue	(80)	(80)	(239)	(288)
Total revenue from Contracts with Customers	1,102	1,206	3,316	3,872
Operating Segments | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	498	555	1,520	1,690
Adjustments for Non-ASC 606 revenue	(8)	(10)	(28)	(30)
Total revenue from Contracts with Customers	490	545	1,492	1,660
Operating Segments | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	444	457	1,288	1,430
Adjustments for Non-ASC 606 revenue	(22)	(26)	(60)	(83)
Total revenue from Contracts with Customers	422	431	1,228	1,347
Operating Segments | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	770	920	2,384	2,756
Adjustments for Non-ASC 606 revenue	(108)	(129)	(342)	(392)
Total revenue from Contracts with Customers	662	791	2,042	2,364
Operating Segments | Grow | Business
Disaggregation of Revenue [Line Items]
Total Revenue	1,125	1,116	3,391	3,504
Adjustments for Non-ASC 606 revenue	(166)	(178)	(509)	(588)
Total revenue from Contracts with Customers	959	938	2,882	2,916
Operating Segments | Grow | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	557	571	1,665	1,882
Adjustments for Non-ASC 606 revenue	(77)	(79)	(234)	(284)
Total revenue from Contracts with Customers	480	492	1,431	1,598
Operating Segments | Grow | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	201	192	599	565
Adjustments for Non-ASC 606 revenue	(6)	(7)	(21)	(23)
Total revenue from Contracts with Customers	195	185	578	542
Operating Segments | Grow | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	117	106	351	337
Adjustments for Non-ASC 606 revenue	(22)	(25)	(60)	(79)
Total revenue from Contracts with Customers	95	81	291	258
Operating Segments | Grow | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	250	247	776	720
Adjustments for Non-ASC 606 revenue	(61)	(67)	(194)	(202)
Total revenue from Contracts with Customers	189	180	582	518
Operating Segments | Nurture | Business
Disaggregation of Revenue [Line Items]
Total Revenue	865	1,006	2,639	3,160
Adjustments for Non-ASC 606 revenue	(5)	(6)	(19)	(20)
Total revenue from Contracts with Customers	860	1,000	2,620	3,140
Operating Segments | Nurture | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	369	404	1,113	1,302
Adjustments for Non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	369	404	1,113	1,302
Operating Segments | Nurture | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	195	226	608	698
Adjustments for Non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	195	226	608	698
Operating Segments | Nurture | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	98	121	297	380
Adjustments for Non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	98	121	297	380
Operating Segments | Nurture | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	203	255	621	780
Adjustments for Non-ASC 606 revenue	(5)	(6)	(19)	(20)
Total revenue from Contracts with Customers	198	249	602	760
Operating Segments | Harvest | Business
Disaggregation of Revenue [Line Items]
Total Revenue	690	897	2,146	2,780
Adjustments for Non-ASC 606 revenue	(43)	(59)	(132)	(179)
Total revenue from Contracts with Customers	647	838	2,014	2,601
Operating Segments | Harvest | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	186	245	590	793
Adjustments for Non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	186	245	590	793
Operating Segments | Harvest | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	94	129	288	404
Adjustments for Non-ASC 606 revenue	(1)	(2)	(3)	(6)
Total revenue from Contracts with Customers	93	127	285	398
Operating Segments | Harvest | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	96	119	290	367
Adjustments for Non-ASC 606 revenue	0	(1)	0	(3)
Total revenue from Contracts with Customers	96	118	290	364
Operating Segments | Harvest | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	314	404	978	1,216
Adjustments for Non-ASC 606 revenue	(42)	(56)	(129)	(170)
Total revenue from Contracts with Customers	272	348	849	1,046
Operating Segments | Other | Business
Disaggregation of Revenue [Line Items]
Total Revenue	214	199	571	592
Adjustments for Non-ASC 606 revenue	(4)	(2)	(9)	(6)
Total revenue from Contracts with Customers	210	197	562	586
Operating Segments | Other | Large Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	70	66	187	183
Adjustments for Non-ASC 606 revenue	(3)	(1)	(5)	(4)
Total revenue from Contracts with Customers	67	65	182	179
Operating Segments | Other | Mid-Market Enterprise | Business
Disaggregation of Revenue [Line Items]
Total Revenue	8	8	25	23
Adjustments for Non-ASC 606 revenue	(1)	(1)	(4)	(1)
Total revenue from Contracts with Customers	7	7	21	22
Operating Segments | Other | Public Sector | Business
Disaggregation of Revenue [Line Items]
Total Revenue	133	111	350	346
Adjustments for Non-ASC 606 revenue	0	0	0	(1)
Total revenue from Contracts with Customers	133	111	350	345
Operating Segments | Other | Wholesale | Business
Disaggregation of Revenue [Line Items]
Total Revenue	3	14	9	40
Adjustments for Non-ASC 606 revenue	0	0	0	0
Total revenue from Contracts with Customers	3	14	9	40
Operating Segments | Fiber Broadband | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	162	160	471	456
Adjustments for Non-ASC 606 revenue	(4)	(4)	(12)	(14)
Total revenue from Contracts with Customers	158	156	459	442
Operating Segments | Other Broadband | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	340	580	1,064	1,787
Adjustments for Non-ASC 606 revenue	(31)	(55)	(96)	(166)
Total revenue from Contracts with Customers	309	525	968	1,621
Operating Segments | Voice and Other | Mass Markets
Disaggregation of Revenue [Line Items]
Total Revenue	245	432	758	1,399
Adjustments for Non-ASC 606 revenue	(9)	(27)	(27)	(126)
Total revenue from Contracts with Customers	$ 236	$ 405	$ 731	$ 1,273