Operating Segments - Segment Financial Data (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) segment	Sep. 30, 2015 USD ($)
Operating Segments
Operating segments number \| segment			3
Revenues:
Revenues	$ 5,170	$ 5,551	$ 14,231	$ 18,156
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Equity earnings in unconsolidated entities	46	45	133	134
Segment profit/(loss)	428	487	1,261	1,371
Maintenance capital	47	52	128	154
Transportation
Revenues:
Revenues	159	172	482	538
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Equity earnings in unconsolidated entities	46	45	133	134
Segment profit/(loss)	261	254	760	681
Maintenance capital	29	34	86	101
Facilities
Revenues:
Revenues	135	132	405	393
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Segment profit/(loss)	173	146	488	432
Maintenance capital	15	16	32	48
Supply and Logistics
Revenues:
Revenues	4,876	5,247	13,344	17,225
Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments
Segment profit/(loss)	(6)	87	13	258
Maintenance capital	3	2	10	5
Interest expense related to hedged inventory purchases	5	1	10	4
Operating Segments
Revenues:
Revenues	5,562	5,918	15,358	19,230
Operating Segments \| Transportation
Revenues:
Revenues	401	401	1,188	1,203
Operating Segments \| Facilities
Revenues:
Revenues	282	263	817	789
Operating Segments \| Supply and Logistics
Revenues:
Revenues	4,879	5,254	13,353	17,238
Intersegment
Revenues:
Revenues	392	367	1,127	1,074
Intersegment \| Transportation
Revenues:
Revenues	242	229	706	665
Intersegment \| Facilities
Revenues:
Revenues	147	131	412	396
Intersegment \| Supply and Logistics
Revenues:
Revenues	$ 3	$ 7	$ 9	$ 13

The interest expense incurred related to hedged inventory purchases, which is included in segment profit.

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Capital expenditures for the replacement of partially or fully depreciated assets in order to maintain the operating and/or earnings capacity of the company's existing assets.

+ References

No definition available.

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- Definition

Revenues and equity earnings in unconsolidated entities less (a) purchases and related costs, (b) field operating costs and (c) segment general and administrative expenses. Excludes depreciation and amortization.

+ References

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(12))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(10))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section S99
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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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