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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2024
Segment Reporting [Abstract]  
Schedule of Selected Information and Details for MMC's Operating Segments
Selected information about the Company’s segments for the three and six months ended June 30, 2024 and 2023 is as follows:
Three Months Ended
 June 30,		Six Months Ended
 June 30,
(In millions)Revenue Operating Income/(Loss)Revenue Operating Income/(Loss)
2024 –
Risk and Insurance Services$4,022 
(a)
$1,297 $8,295 
(c) 
$2,862 
Consulting2,216 
(b)
410 4,430 
(d) 
842 
Total Segments6,238 1,707 12,725 3,704 
Corporate/Eliminations(17)(65)(31)(137)
Total Consolidated$6,221 $1,642 $12,694 $3,567 
2023 –
Risk and Insurance Services$3,722 
(a)
$1,157 $7,628 
(c)
$2,552 
Consulting2,172 
(b)
388 4,203 
(d)
799 
Total Segments5,894 1,545 11,831 3,351 
Corporate/Eliminations(18)(88)(31)(168)
Total Consolidated$5,876 $1,457 $11,800 $3,183 
(a)Includes inter-segment revenue of $4 million and $5 million in 2024 and 2023, respectively, interest income on fiduciary funds of $125 million and $108 million in 2024 and 2023, respectively, and equity method income of $10 million and $12 million in 2024 and 2023, respectively.
(b)Includes inter-segment revenue of $13 million in 2024 and 2023.
(c)Includes inter-segment revenue of $5 million in both 2024 and 2023, interest income on fiduciary funds of $247 million and $199 million in 2024 and 2023, respectively, and equity method income of $10 million and $11 million in 2024 and 2023, respectively.
(d)Includes inter-segment revenue of $26 million in both 2024 and 2023. Revenue in 2024 also includes a net gain of $21 million from the sale of Mercer's U.K. pension administration and U.S. health and benefits administration businesses.
Schedule of Details of Operating Segment Revenue
Details of operating segment revenue for the three and six months ended June 30, 2024 and 2023 are as follows:
Three Months Ended
 June 30,		Six Months Ended
 June 30,
(In millions)2024202320242023
Risk and Insurance Services
Marsh$3,342 $3,103 $6,423 $5,903 
Guy Carpenter680 619 1,872 1,725 
Total Risk and Insurance Services4,022 3,722 8,295 7,628 
Consulting    
Mercer1,379 1,374 2,804 2,718 
Oliver Wyman Group837 798 1,626 1,485 
Total Consulting2,216 2,172 4,430 4,203 
Total Segments6,238 5,894 12,725 11,831 
Corporate Eliminations(17)(18)(31)(31)
Total$6,221 $5,876 $12,694 $11,800