v3.26.1
Supplemental Disclosures of Cash Flow Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Supplemental disclosures of cash flow information:      
Cash and cash equivalents $ 1,855 $ 1,507 $ 3,132
Fiduciary funds (included in fiduciary assets) 3,550 3,476  
Total cash, cash equivalents and restricted cash 5,405 4,983  
Decrease in cash, cash equivalents and other restricted cash [1] (1,053) (95)  
Common Stock [Member]      
Supplemental disclosure of non-cash investing and financing activities:      
Fair value of Newfront ordinary shares issued 63 0  
Contingent Consideration Related to Acquisition [Member]      
Supplemental disclosure of non-cash investing and financing activities:      
Fair value of Newfront ordinary shares issued 18 0  
Non-Fiduciary [Member]      
Supplemental disclosures of cash flow information:      
Decrease in cash, cash equivalents and other restricted cash (1,260) (411)  
Fiduciary [Member]      
Supplemental disclosures of cash flow information:      
Decrease in cash, cash equivalents and other restricted cash $ 207 $ 316  
[1] The amounts of cash, cash equivalents and restricted cash, their respective classification on the condensed consolidated balance sheets as well as their respective portions of the increase or decrease in cash, cash equivalents and restricted cash for each of the periods presented have been included in Note 19 — Supplemental Disclosures of Cash Flow Information.