v3.26.1
Interest in Master Trust (Tables)
 12 Months Ended
Dec. 31, 2025
EBP 006  
EBP, Master Trust [Line Items]  
Schedule of Master Trust assets, liabilities and comingled funds
The following tables summarize the assets and liabilities of the commingled funds of the Master Trust and the Plan's interest in those assets and liabilities at December 31, 2025 and 2024:
December 31, 2025
Master Trust - Commingled FundsPlan's Interest in Master Trust Commingled Funds
Marsh Stock Fund
Marsh common stock at fair value$569,666,803 $47,818,201 
Short-term investment fund at fair value10,613,206 890,879 
Accrued interest receivable36,384 3,054 
Liability for expenses incurred(21,253)(1,784)
580,295,140 48,710,350 
Stable Value Fund
Security backed investment contracts at contract value512,986,091 56,510,961 
Short-term investment fund at fair value23,594,468 2,599,185 
Accrued interest receivable85,026 9,367 
Liability for expenses incurred(119,202)(13,131)
536,546,383 59,106,382 
Common collective trusts at fair value3,330,896,704 555,971,903 
Net assets of commingled investments held by Master Trust$4,447,738,227 $663,788,635 
December 31, 2024
Master Trust - Commingled FundsPlan's Interest in Master Trust Commingled Funds
Marsh Stock Fund
Marsh common stock at fair value$722,475,231 $61,637,116 
Short-term investment fund at fair value15,128,903 1,290,704 
Accrued interest receivable55,559 4,740 
Liability for expenses incurred(21,250)(1,813)
737,638,443 62,930,747 
Stable Value Fund
Security backed investment contracts at contract value517,049,326 50,953,846 
Short-term investment fund at fair value11,086,840 1,092,579 
Accrued interest receivable43,260 4,263 
Liability for expenses incurred(118,452)(11,673)
528,060,974 52,039,015 
Common collective trusts at fair value2,784,329,533 394,839,791 
Net assets of commingled investments held by Master Trust$4,050,028,950 $509,809,553 
The following table summarizes the net investment income of the commingled investments held by the Master Trust for the year ended December 31, 2025:
Investment income and expenses:
   
Net depreciation in fair value of Marsh common stock$(82,925,232)
Net appreciation in fair value of common collective trusts521,402,298 
Dividends11,144,144 
Interest 16,703,838 
Expenses(771,552)
Net investment income
$465,553,496 
Net investment income from commingled investments in Master Trust - By plan:
Marsh & McLennan Agency 401(k) Savings & Investment Plan$79,523,502 
Marsh Plan$386,029,994