Segment Information - Reconciliation (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Depreciation and amortization	$ (707,000,000)	$ (755,000,000)		$ (2,198,000,000)	$ (2,234,000,000)
Goodwill impairment	0	0	$ (8,800,000,000)	0	(8,793,000,000)
OPERATING INCOME (LOSS)	126,000,000	223,000,000		306,000,000	(7,808,000,000)
Total other expense, net	(298,000,000)	(308,000,000)		(417,000,000)	(287,000,000)
LOSS BEFORE INCOME TAXES	(172,000,000)	(85,000,000)		(111,000,000)	(8,095,000,000)
Income tax (benefit) expense	(24,000,000)	(7,000,000)		29,000,000	208,000,000
NET LOSS	(148,000,000)	(78,000,000)		(140,000,000)	(8,303,000,000)
Operating Segments
Segment Reporting Information [Line Items]
Total segment adjusted EBITDA	1,663,000,000	1,823,000,000		5,116,000,000	5,790,000,000
Segment Reconciling Items
Segment Reporting Information [Line Items]
Depreciation and amortization	(707,000,000)	(755,000,000)		(2,198,000,000)	(2,234,000,000)
Goodwill impairment	0	0		0	(8,793,000,000)
Other unallocated expense	(820,000,000)	(829,000,000)		(2,591,000,000)	(2,532,000,000)
Stock-based compensation expense	(10,000,000)	(16,000,000)		(21,000,000)	(39,000,000)
OPERATING INCOME (LOSS)	126,000,000	223,000,000		306,000,000	(7,808,000,000)
Total other expense, net	$ (298,000,000)	$ (308,000,000)		$ (417,000,000)	$ (287,000,000)