Summary of Significant Accounting Policies - Changes in Redeemable Non-controlling Interest (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Opening balance, January 1	$ 253	$ 320	$ 299
Net income (loss)	(3)	(21)	(6)
Acquisitions	0	(18)	0
Remeasurement	42	0	0
Currency translation adjustments and other	(5)	(28)	27
Closing balance, December 31	$ 287	$ 253	$ 320