Business Combinations - Additions, Payments, and Net Changes, as well as Interest Expense Accretion on Estimated Acquisition Earn-Out Payables (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Business Combinations [Abstract]
Beginning balance	$ 169	$ 231	$ 249	$ 252
Additions to estimated acquisition earn-out payables	8	11	28	50
Payments for estimated acquisition earn-out payables	(38)	(11)	(135)	(74)
Subtotal	139	231	142	228
Net change in earnings from estimated acquisition earn-out payables:
Change in fair value on estimated acquisition earn-out payables	(9)	28	(15)	23
Interest expense accretion	1	2	6	7
Net change in earnings from estimated acquisition earn-out payables	(8)	30	(9)	30
Foreign currency translation adjustments during the year	6	(3)	4	0
Ending balance	$ 137	$ 258	$ 137	$ 258