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Document And Entity Information
6 Months Ended
Jun. 30, 2017
Document And Entity Information  
Entity Central Index Key 0001282400
Entity Registrant Name MEWBOURNE ENERGY PARTNERS 04-A LP
Document Type 10-Q
Document Period End Date Jun. 30, 2017
Current Fiscal Year End Date --12-31
Amendment Flag false
Entity Filer Category Smaller Reporting Company
Is Entity a Well-known Seasoned Issuer? No
Is Entity a Voluntary Filer? No
Is Entity's Reporting Status Current? Yes
Document Fiscal Period Focus Q2
Document Fiscal Year Focus 2017