Business Combinations - Additional Information (Details) $ in Millions		3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2024 USD ($) Acquisition	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Business Acquisition [Line Items]
Number of acquisitions | Acquisition		6
Total consideration for acquisition		$ 87
Cash paid	$ 5	76
Initial fair value of earnout-out liabilities	9	9
Other payables	2	2
Goodwill acquired in connection with acquisitions and measurement period adjustments		66
Other identifiable intangible assets acquired in connection with acquisitions and measurement period adjustments		$ 21
Weighted average useful lives for acquired amortizable intangible assets		15 years
Estimated acquisition earn-out payables	203	$ 203	$ 249	$ 255	$ 252
Maximum future contingency payments acquisitions	566	566
Other Liabilities
Business Acquisition [Line Items]
Estimated acquisition earn-out payables	85	85
Accounts payable
Business Acquisition [Line Items]
Estimated acquisition earn-out payables	118	$ 118
Business Combinations - Stock Deals
Business Acquisition [Line Items]
Number of acquisitions | Acquisition		2
Assets and Assumed Certain Liabilities
Business Acquisition [Line Items]
Number of acquisitions | Acquisition		3
Book of Business Purchases
Business Acquisition [Line Items]
Number of acquisitions | Acquisition		1
GRP Holdco Limited
Business Acquisition [Line Items]
Maximum potential earn- out payable	$ 0	$ 0
Kentro Capital Limited
Business Acquisition [Line Items]
Acquisition date		Oct. 01, 2023