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Segment Information - Segment Results and Operating Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Operating revenues by products and services |  |  |  |
Segment revenue | $ 3,268 | $ 3,661 | $ 6,558 | $ 7,399
Cost of services and products | 1,653 | 1,740 | 3,305 | 3,557
Business |  |  |  |
Operating revenues by products and services |  |  |  |
Segment revenue | 2,577 | 2,908 | 5,168 | 5,876
Cost of services and products | 761 | 773 | 1,500 | 1,603
Selling, general and administrative | 457 | 570 | 954 | 1,113
Total segment expense | 1,218 | 1,343 | 2,454 | 2,716
Total segment adjusted EBITDA | 1,359 | 1,565 | 2,714 | 3,160
Mass Markets |  |  |  |
Operating revenues by products and services |  |  |  |
Segment revenue | 691 | 753 | 1,390 | 1,523
Cost of services and products | 20 | 21 | 37 | 42
Selling, general and administrative | 308 | 339 | 614 | 674
Total segment expense | 328 | 360 | 651 | 716
Total segment adjusted EBITDA | $ 363 | $ 393 | $ 739 | $ 807

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