Supplementary Information for Certain Balance Sheet Accounts - Prepaid and Other Current Assets (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepayments and accrued income	$ 114	$ 137
Short-term investments	0	200
Deferred contract costs	64	74
Derivatives and investments	28	35
Deferred compensation plan assets	12	19
Corporate income and other taxes	116	82
Acquired renewal commissions receivable	9	11
Other current assets	47	54
Total prepaid and other current assets	$ 390	$ 612