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Guarantees (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2012
Guarantees (Textual) [Abstract]
Operating lease, remaining obligation		$ 1,556,000,000
Environmental accruals for known contaminations		496,000,000	$ 485,000,000
Residual Value Guarantees
Guarantees (Textual) [Abstract]
Maximum exposure of loss/potential amount of future payments		363,000,000
Other Guarantees
Guarantees (Textual) [Abstract]
Maximum exposure of loss/potential amount of future payments		212,000,000
Indemnifications
Guarantees (Textual) [Abstract]
Carrying amount of indemnifications		193,000,000
Asset Retirement Obligations And Accrued Environmental Cost | Indemnifications
Guarantees (Textual) [Abstract]
Environmental accruals for known contaminations		102,000,000
Merey Sweeny | Guarantees of Joint Venture Debt
Guarantees (Textual) [Abstract]
Maximum exposure of loss/potential amount of future payments		326,000,000
Merey Sweeny | MSLP 8.85% Senior Notes | Guarantees of Joint Venture Debt
Guarantees (Textual) [Abstract]
Percentage of guarantee				100.00%
Maximum exposure of loss/potential amount of future payments		123,000,000
Facilities | Residual Value Guarantees
Guarantees (Textual) [Abstract]
Maximum exposure of loss/potential amount of future payments	$ 554,000,000
Facilities | Maximum | Other Guarantees
Guarantees (Textual) [Abstract]
Lessee leasing arrangements, operating leases	5 years
Railcars | Residual Value Guarantees
Guarantees (Textual) [Abstract]
Maximum exposure of loss/potential amount of future payments		94,000,000
Operating leases, expense		28,000,000
Operating lease, remaining obligation		66,000,000
Railcars | Permanently Taken Out Of Service | Residual Value Guarantees
Guarantees (Textual) [Abstract]
Operating leases, expense		20,000,000
Operating leases executory costs		$ 12,000,000

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Guarantees.

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No definition available.

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Capital Leases, Income Statement, Executory Costs

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Percentage of guarantee.

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859

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The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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