Segment Information - Additional Information (Details) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2024 USD ($)	Dec. 31, 2023	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) Segment	Jun. 30, 2023 USD ($)	Dec. 31, 2023 Segment
Segment Reporting Information [Line Items]
Number of reportable segments | Segment				3		4
Revenues | $	$ 1,178		$ 1,047	$ 2,435	$ 2,163
Number of operating segments | Segment				3
Third-party Claims Administration and Adjusting Services Businesses | Services
Segment Reporting Information [Line Items]
Percentage of business sold		50.00%
England, Bermuda, Cayman, Islands and The Republic of Ireland
Segment Reporting Information [Line Items]
Revenues | $	$ 172		$ 129	$ 330	$ 247