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Commitments and Contingent Liabilities Commitments for Jones Act (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Philly Tankers LLC [Member]  
Other Commitments [Line Items]  
Purchase Obligation, Due in Next Twelve Months $ 383
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months $ 195
Philly Tankers LLC [Member]  
Other Commitments [Line Items]  
Number of Vessels 4