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Accounting for suspended exploratory well costs	9 Months Ended
Accounting for suspended exploratory well costs	Sep. 30, 2016
Accounting for suspended exploratory well costs	11. Accounting for suspended exploratory well costs For the category of exploratory well costs at year-end 2015 that were capitalized for a period greater than 12 months, a total of $24 million was expensed in the first nine months of 2016.