Business Combinations - Additions, Payments, and Net Changes, as well as Interest Expense Accretion on Estimated Acquisition Earn-Out Payables (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Business Combination [Abstract]
Beginning balance	$ 167	$ 249	$ 252
Additions from new acquisitions	58	73	67
Assumed estimated acquisition earn-out payables	435	3	21
Payments	(146)	(154)	(119)
Subtotal	514	171	221
Net change in earnings from estimated acquisition earn-out payables:
Change in fair value	16	(6)	14
Interest expense accretion	9	8	7
Net change in earnings from estimated acquisition earn-out payables	25	2	21
Foreign currency translation adjustments during the year	2	(6)	7
Ending balance	$ 541	$ 167	$ 249