Commitments and Contingencies - Additional Information 1 (Detail) (USD $)
In Millions, unless otherwise specified |
6 Months Ended | |
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Jun. 30, 2013
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Dec. 31, 2012
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Loss Contingencies [Line Items] | ||
Receivables for recoverable costs | $ 49 | $ 51 |
Contractual commitments to acquire property, plant and equipment and advance funds to equity method investees | 870 | |
Galveston Bay Refinery and Related Assets [Member]
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Loss Contingencies [Line Items] | ||
Contingent consideration | 700 | |
Standby Letters Of Credit [Member] | TAME [Member] | Financial Guarantee [Member]
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Loss Contingencies [Line Items] | ||
Credit agreement expiration date | Dec. 31, 2018 | |
Maximum potential undiscounted payments | $ 25 | |
Percentage of credit agreement agreed to reimburse | 50.00% |