Acquisitions - Narrative (Details) $ in Millions, $ in Millions	Apr. 30, 2025 USD ($)	Sep. 30, 2025 USD ($)	Apr. 30, 2025 AUD ($)	Dec. 31, 2024 USD ($)
Business Combination [Line Items]
Goodwill		$ 3,702		$ 3,272
Care TopCo Pty Ltd
Business Combination [Line Items]
Business combination, recognized asset acquired to liability assumed, excess (less)			$ 471
Fair value of net assets acquired	$ 301
Goodwill	$ 214
Care TopCo Pty Ltd | Minimum
Business Combination [Line Items]
Useful life	5 years
Care TopCo Pty Ltd | Maximum
Business Combination [Line Items]
Useful life	15 years