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Segment Information - Segment Results and Operating Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Operating revenues by products and services
Segment revenue	$ 3,087	$ 3,221	$ 9,361	$ 9,779
Cost of services and products	1,700	1,692	5,011	4,997
Business
Operating revenues by products and services
Segment revenue	2,456	2,537	7,470	7,706
Cost of services and products	691	766	2,120	2,265
Headcount costs	294	300	874	948
Non-headcount costs	363	371	1,050	1,061
Total segment expense	1,348	1,437	4,044	4,274
Total segment adjusted EBITDA	1,108	1,100	3,426	3,432
Mass Markets
Operating revenues by products and services
Segment revenue	631	684	1,891	2,073
Cost of services and products	13	16	40	53
Headcount costs	142	162	434	484
Non-headcount costs	129	149	372	420
Total segment expense	284	327	846	957
Total segment adjusted EBITDA	$ 347	$ 357	$ 1,045	$ 1,116

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