v3.25.4
Long-Term Debt (Summarized Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Long-term Debt [Line Items]    
Debt issuance costs $ (70) $ (78)
Long-term debt 34,241 36,755
Exxon Mobil Corporation    
Long-term Debt [Line Items]    
Debt instrument, unamortized premium 72 76
XTO Energy Inc.    
Long-term Debt [Line Items]    
Debt instrument, unamortized premium 60 66
Pioneer Natural Resources    
Long-term Debt [Line Items]    
Debt instrument, unamortized discount (premium), net 267 348
Parsley Energy LLC    
Long-term Debt [Line Items]    
Debt instrument, unamortized discount 5 7
3.043% notes due 2026 | Exxon Mobil Corporation | Other U.S. Dollar Obligations    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 0 2,500
Interest rate 3.043%  
2.275% notes due 2026 | Exxon Mobil Corporation | Other U.S. Dollar Obligations    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 0 1,000
Interest rate 2.275%  
3.294% notes due 2027 | Exxon Mobil Corporation | Other U.S. Dollar Obligations    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 1,000 1,000
Interest rate 3.294%  
2.440% notes due 2029 | Exxon Mobil Corporation | Other U.S. Dollar Obligations    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 1,250 1,250
Interest rate 2.44%  
3.482% notes due 2030 | Exxon Mobil Corporation | Other U.S. Dollar Obligations    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 2,032 1,992
Interest rate 3.482%  
2.610% notes due 2030 | Exxon Mobil Corporation | Other U.S. Dollar Obligations    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 2,016 2,000
Interest rate 2.61%  
2.995% notes due 2039 | Exxon Mobil Corporation | Other U.S. Dollar Obligations    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 750 750
Interest rate 2.995%  
4.227% notes due 2040 | Exxon Mobil Corporation | Other U.S. Dollar Obligations    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 2,043 2,076
Interest rate 4.227%  
3.567% notes due 2045 | Exxon Mobil Corporation | Other U.S. Dollar Obligations    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 986 1,000
Interest rate 3.567%  
4.114% notes due 2046 | Exxon Mobil Corporation | Other U.S. Dollar Obligations    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 2,497 2,500
Interest rate 4.114%  
3.095% notes due 2049 | Exxon Mobil Corporation | Other U.S. Dollar Obligations    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 1,500 1,500
Interest rate 3.095%  
4.327% notes due 2050 | Exxon Mobil Corporation | Other U.S. Dollar Obligations    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 2,750 2,750
Interest rate 4.327%  
3.452% notes due 2051 | Exxon Mobil Corporation | Other U.S. Dollar Obligations    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 2,750 2,750
Interest rate 3.452%  
0.524% notes due 2028 | Exxon Mobil Corporation - Euro-denominated | Other Foreign Currency Obligations    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 1,175 1,039
Interest rate 0.524%  
0.835% notes due 2032 | Exxon Mobil Corporation - Euro-denominated | Other Foreign Currency Obligations    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 1,175 1,039
Interest rate 0.835%  
1.408% notes due 2039 | Exxon Mobil Corporation - Euro-denominated | Other Foreign Currency Obligations    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 1,175 1,039
Interest rate 1.408%  
6.100% senior notes due 2036 | XTO Energy Inc. | Senior Notes    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 186 187
Interest rate 6.10%  
6.750% senior notes due 2037 | XTO Energy Inc. | Senior Notes    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 282 284
Interest rate 6.75%  
6.375% senior notes due 2038 | XTO Energy Inc. | Senior Notes    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 219 221
Interest rate 6.375%  
1.125% senior notes due 2026 | Pioneer Natural Resources | Senior Notes    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 0 718
Interest rate 1.125%  
5.100% senior notes due 2026 | Pioneer Natural Resources | Senior Notes    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 0 1,097
Interest rate 5.10%  
7.200% senior notes due 2028 | Pioneer Natural Resources | Senior Notes    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 247 250
Interest rate 7.20%  
1.900% senior notes due 2030 | Pioneer Natural Resources | Senior Notes    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 958 931
Interest rate 1.90%  
2.150% senior notes due 2031 | Pioneer Natural Resources | Senior Notes    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 869 846
Interest rate 2.15%  
4.125% senior notes due 2028 | Parsley Energy LLC | Senior Notes    
Long-term Debt [Line Items]    
Senior notes, noncurrent $ 133 131
Interest rate 4.125%  
Industrial revenue bonds due 2026-2051 | Combined Exxon Mobil And Affiliates    
Long-term Debt [Line Items]    
Other long-term debt $ 2,005 2,032
Average effective interest rate 2.54%  
Finance leases & other obligations | Combined Exxon Mobil And Affiliates    
Long-term Debt [Line Items]    
Average effective interest rate 4.668%  
Finance lease liability - noncurrent included in Long-term debt $ 6,313 $ 3,951