Estimates, Significant Accounting Policies and Balance Sheet Detials (Net change in operating assets and liabilities (net of acquisitions) included in cash flows) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ESTIMATES, SIGNIFICANT ACCOUNTING POLICIES AND BALANCE SHEET DETAIL
Accounts receivable	$ 600	$ (557)	$ 267
Accounts receivable from related companies	(22)	26	(12)
Inventories	51	(254)	(258)
Exchanges receivable	18	(8)	14
Other current assets	132	(58)	574
Other non-current assets, net	(6)	(45)	(30)
Accounts payable	(851)	542	(990)
Accounts payable to related companies	3	(143)	101
Exchanges payable	(99)	128	0
Accrued and other current liabilities	(92)	211	(169)
Other non-current liabilities	(73)	147	25
Price risk management assets and liabilities, net	19	(147)	(15)
Net change in operating assets and liabilities, net of effects of acquisitions and deconsolidations	$ (320)	$ (158)	$ (493)

ESTIMATES

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- Definition

The net change during the reporting period in payables related to delivery imbalances.

+ References

No definition available.

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The net change during the reporting period in receivables related to delivery imbalances.

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- Definition

The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid.

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The aggregate increase (decrease) during the reporting period in the amount due from the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; an entity and its principal owners, management, or member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

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The increase (decrease) during the reporting period in the aggregate amount of obligations to be paid to the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entities' management; an entity and its principal owners, management, or member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

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The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

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The increase (decrease) during the reporting period in other current operating assets not separately disclosed in the statement of cash flows.

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The increase (decrease) during the reporting period in other noncurrent operating assets not separately disclosed in the statement of cash flows.

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No definition available.

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The increase (decrease) during the reporting period in other noncurrent operating liabilities not separately disclosed in the statement of cash flows.

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Amount of increase (decrease) in fair value of financial instruments other than those that are purchased and held principally for the purpose of hedging or mitigating market risk, credit risk, legal risk, operational risk and other types of risk.

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