v3.8.0.1
Document And Entity Information
3 Months Ended
Mar. 31, 2018
shares
Document And Entity Information [Abstract]  
Document Type 10-Q
Amendment Flag false
Document Period End Date Mar. 31, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus Q1
Trading Symbol XOM
Entity Registrant Name EXXON MOBIL CORP
Entity Central Index Key 0000034088
Current Fiscal Year End Date --12-31
Entity Filer Category Large Accelerated Filer
Entity Common Stock, Shares Outstanding 4,233,834,437