v3.26.1
Fair Value Measurements (Details) - EMSP 334 - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments $ 25,652 $ 23,423
Exxon Mobil Corporation common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 7,361 7,165
Value    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 10,397 10,092
Value | Exxon Mobil Corporation common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 7,361 7,165
Value | U.S. Government Securities    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 2,936 2,893
Value | Corporate Debt Securities    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 100 34
Quoted Prices In Active Markets for Identical Assets (Level 1)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 7,361 7,165
Quoted Prices In Active Markets for Identical Assets (Level 1) | Exxon Mobil Corporation common stock    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 7,361 7,165
Significant Other Observable Inputs (Level 2)    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 3,036 2,927
Significant Other Observable Inputs (Level 2) | U.S. Government Securities    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 2,936 2,893
Significant Other Observable Inputs (Level 2) | Corporate Debt Securities    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 100 34
Common/Collective trusts (at net asset value) | S&P 500 Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 8,004 6,991
Common/Collective trusts (at net asset value) | Small & Mid Cap Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 3,293 3,074
Common/Collective trusts (at net asset value) | World Ex-US Equity Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 2,390 1,798
Common/Collective trusts (at net asset value) | Aggregate Bond Fund    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments 1,322 1,172
Common/Collective trusts (at net asset value) | Short term investments    
EBP, Investment, Fair Value and NAV [Line Items]    
Total investments $ 246 $ 296