Supplemental Disclosures of Cash Flow Information and Non-Cash Financing and Investing Activities - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Noncash or Part Noncash Acquisitions [Line Items]
Payments of accrued federal income tax payments due		$ 91
Tax payments associated with gain on disposal of businesses sold		30
Effect of foreign exchange rate changes on cash and cash equivalents inclusive of fiduciary cash	$ 66	$ 45
Deferred federal income tax payments amounts due to Hurricane Debby and Milton tax relief			$ 90