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Contingencies (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
site
Commitments and Contingencies Disclosure [Abstract]  
Number of Superfund sites for which company may be liable | site 1
Name of plaintiff Freeny
Parties jointly and severally liable in litigation Murphy Oil Corporation and Murphy Oil USA, Inc.
Allegations the plaintiffs allege that the Company has infringed on their electronic pricing system patent.
Trial or alternative dispute resolution At trial, and before any judgment was entered for any party, a settlement was reached between the parties and the case was dismissed. The settlement agreement resulted in the Company paying an immaterial amount to the plaintiffs for a license to use their patents for past and future periods
Workers' compensation deductible (per occurrence) $ 1,000,000
Workers' compensation accrued liability 18,000,000
Outstanding letters of credit 17,800,000
Liability accrued $ 0