Percentage of Completion Contracts
During 2013, we recognized estimated project losses of $232 million related to our long-term early production facility construction contracts in Iraq accounted for under the percentage of completion method. Total estimated losses on these projects were $307 million at December 31, 2013. As of December 31, 2013, our percentage of completion project estimates include $36 million of claims revenue and $82 million for liquidated damages that we are contractually obligated to pay as a result of delays in the expected completion of the project. We have a variety of unapproved contract change orders or claims that are not included in our revenues as of December 31, 2013. Amounts representing these contract change orders or claims are included in revenue only when they can be estimated reliably and their realization is reasonably assured.
During 2012, we recognized losses of $100 million related to a long-term construction contract in Iraq accounted for under the percentage of completion method. As of December 31, 2012, we had claims against our customer of $68 million that were not included in our revenue estimates because they do not meet the criteria for recognition. Additionally, we had accrued $17 million for liquidated damages that we are contractually obligated to pay as a result of delays in the expected completion of the project. In addition, in the quarter ended December 31, 2012, we recognized $63 million in revenue upon revision of project estimates on our projects in Mexico. These amounts were determined to be realizable in the fourth quarter of 2012.