Number Of Leased Centers Affected By Catastrophic Event

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Stock Repurchased During Period, Value Excluding Excise Taxes

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of impairment loss for asset. Includes, but is not limited to, tangible and intangible assets and goodwill.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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The net result for the period of deducting operating expenses from operating revenues.

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Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

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Supplemental Financial Information - Narrative (Details) shares in Millions, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2026 center	Sep. 30, 2026 USD ($) shares	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($) shares	Sep. 30, 2025 USD ($)	Jun. 30, 2026 USD ($)	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, including portion attributable to noncontrolling interest		$ 2,837	$ 4,741	$ 2,837	$ 4,741	$ 2,987	$ 3,930	$ 4,623	$ 4,685	$ 4,374	$ 4,102
Repurchase of Class A common stock (in shares) \| shares		12.7		56.4
Repurchased of Class A common stock		$ 201		$ 1,100
Share repurchase program, remaining authorized, amount		706		706
Operating income (loss)		(450)	$ 162	(1,248)	$ 465
Fire
Accumulated Other Comprehensive Income (Loss) [Line Items]
Number of leased centers affected by catastrophic event \| center	1
Operating income (loss)		(248)		(248)
Loss on owned inventory		95		95
Asset, impairment loss		153		153
Accumulated foreign currency adjustment attributable to parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, including portion attributable to noncontrolling interest		(143)		(143)				(297)
Accumulated defined benefit plans adjustment attributable to parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Equity, including portion attributable to noncontrolling interest		$ (81)		$ (81)				$ (84)