Supplementary Information for Certain Balance Sheet Accounts - Prepaid and Other Current Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepayments and accrued income	$ 123	$ 132
Deferred contract costs	76	71
Derivatives and investments	4	43
Deferred compensation plan assets	16	16
Corporate income and other taxes	87	89
Acquired renewal commissions receivable	5	9
Other current assets	53	54
Total prepaid and other current assets	$ 364	$ 414