Segment Information - Schedule of Segment Results (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Operating revenues by products and services
Segment revenue	$ 3,661	$ 4,612	$ 7,399	$ 9,288
Cost of services and products	1,740	2,058	3,557	4,043
Selling, general and administrative	790	815	1,511	1,615
Operating Segments
Operating revenues by products and services
Segment revenue	3,661	4,612	7,399	9,288
Total segment adjusted EBITDA	2,260	3,003	4,557	6,118
Operating Segments | Business
Operating revenues by products and services
Segment revenue	2,897	3,417	5,853	6,818
Cost of services and products	746	845	1,547	1,657
Selling, general and administrative	302	313	592	635
Total segment expense	1,048	1,158	2,139	2,292
Total segment adjusted EBITDA	1,849	2,259	3,714	4,526
Operating Segments | Mass Markets
Operating revenues by products and services
Segment revenue	764	1,195	1,546	2,470
Cost of services and products	24	33	49	65
Selling, general and administrative	329	418	654	813
Total segment expense	353	451	703	878
Total segment adjusted EBITDA	$ 411	$ 744	$ 843	$ 1,592