Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2018
Accounting Policies [Abstract]
Revenue Recognition	Revenue Recognition In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers”, a comprehensive new revenue recognition standard. The Partnership has used the modified retrospective transition method to apply the effects of adopting this ASU, effective January 1, 2018, and has evaluated the impact of the ASU on its accounting policies, internal controls, and financial statements and related disclosures. The Partnership has only non-operated working interests in oil and gas wells and receives monthly net revenue checks from the operator of these oil and gas wells. It recognizes revenue for oil and condensate when control transfers to the purchaser at a contractually specified delivery point at or near the wellhead at prevailing prices in accordance with arrangements which are customary in the oil and gas industry. Sales of gas applicable to the Partnership’s interest are recorded as revenue when the gas is metered and control is transferred pursuant to the gas sales contracts covering the Partnership’s interest in gas reserves. The Partnership has reviewed its partnership, joint operating and marketing agreements as they relate to its non-operated working interests and this ASU, which includes provisions regarding revenues and expenses under a gross-versus-net presentation as it relates to principal vs agent relationship, and has evaluated the impact on the presentation of its revenues and expenses under this gross-versus-net presentation guidance. Based on its review of how information about revenue has been presented for other purposes, including disclosures presented outside the financial statements and information used by management for evaluating performance operations, the appropriate categories for the disaggregation of revenue are oil and gas sales, as presented in the Partnership’s financial statements and related disclosures. Disaggregation of Revenue The Partnership has identified two material revenue streams in its business: oil sales and natural gas sales. Revenue attributable to each of the Partnership’s identified revenue streams is disaggregated in the Condensed Statements of Operations. Significant Judgments Principal versus agent In the case of the non-operating agreements, the operator is responsible for providing the goods due to its contractual obligations with the purchaser. Based on the joint operating and marketing agreement arrangements between the Partnership and operator, the Partnership does not take title to the product prior to the operator’s ultimate sale to a customer. The operator is responsible for fulfilling promises to provide specified goods and remitting proceeds back to the Partnership for the Partnership’s proportionate share of the total product sold. MOC, rather than the Partnership, is primarily responsible for fulfilling promises to provide specified goods. MOC, as the operator, enters into the sales contract with the third-party customers and directs all activities from the wellhead to the delivery point that make the commodity available to the customer; there is no agreement between the Partnership and the customers. In the event a production delay occurs as a result of, for example, well-equipment failure, MOC is responsible for correcting the issues preventing fulfillment of its promises to deliver product to its customers. Transaction price allocated to remaining performance obligations For the Partnership’s product sales, the Partnership has utilized the practical expedient in ASC 606 that states that it is not required to disclose the transaction price allocated to remaining performance obligations if the variable consideration is allocated entirely to a wholly unsatisfied performance obligation. Under the operator’s sales contracts, each unit of product represents a separate performance obligation; therefore, future volumes are wholly unsatisfied and disclosure of the transaction price allocated to remaining performance obligations is not required. Contract balances Under the Partnership’s joint operating and marketing agreements, the Partnership is entitled to consideration as production occurs at the wellhead and the value of such consideration is an estimate. Final amounts are only determined upon sale by the operator to the ultimate third-party customer, and recorded in “Accounts receivable, affiliate” in its balance sheet. Based upon its assessments, the ASU has no effect on the timing of the Partnership’s revenue recognition or its financial position.
New Accounting Developments	New Accounting Developments In February 2016, the FASB issued ASU 2016-02, “Leases.” ASU 2016-02 requires the recognition of lease assets and lease liabilities by lessees for those leases currently classified as operating leases and makes certain changes to the way lease expenses are accounted for. This update is effective for fiscal years beginning after December 15, 2019, and interim periods within fiscal years beginning after December 15, 2020. This update should be applied using a modified retrospective approach, and early adoption is permitted. In January 2018, the FASB issued ASU 2018-01, which permits an entity to elect an optional transition practical expedient to not evaluate land easements that exist or expire before the Partnership’s adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. The Partnership is currently evaluating the new guidance to determine the impact it will have on its financial statements.

MEWBOURNE ENERGY PARTNERS 08-A LP 10-Q