Financial Instruments - Additional Information (Details) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 02, 2024 $ / shares shares	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jul. 12, 2024 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Period to receive earnout shares				7 years
Fair value of seller earnouts				$ 2		$ 51
(Gain) loss from change in fair value of seller earnouts		$ (19)	$ (3)	(49)	$ (32)
Fair value of seller note		0		0		50	$ 0
(Gain) loss from change in fair value of financial instruments		(19)	(23)	1	(54)
Discontinued Operations, Disposed of by Sale | Divested Business
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Aggregate principal amount, contingent consideration								$ 150
Fair value contingent consideration								$ 43
(Gain) loss from change in fair value of financial instruments		0	20	50	20
Class A Common Stock
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Shares issued (in shares) | shares	1.5
Price per share | $ / shares	$ 7.09
Class Z-A Common Stock
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Equity, contingent consideration at fair value		0		0		$ 0
Class Z Common Stock
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
(Gain) loss from change in fair value of seller earnouts		$ 0	$ 0	$ 0	$ (2)
Maturity | Valuation, Income Approach | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Additional seller note, measurement basis				4 years 9 months 10 days
Seller earnouts liability
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Business combination, contingent consideration, liability expected holding period				2 years 9 months
Seller earnouts liability | Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement Input		0.3991		0.3991
Seller earnouts liability | Risk-free Interest Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Measurement Input		0.0358		0.0358