Estimates (Schedule Of Net Changes In Operating Assets And Liabilities Included Cash Flows From Operating Activities) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Accounts receivable	$ (1,126)	$ 856	$ 600
Accounts receivable from related companies	42	(5)	30
Inventories	(345)	(410)	52
Other current assets	(149)	225	(151)
Other non-current assets, net	(148)	250	(6)
Accounts payable	1,214	(1,043)	(893)
Accounts payable to related companies	(64)	400	5
Exchanges payable	0	0	0
Accrued and other current liabilities	89	(697)	(158)
Other non-current liabilities	158	(233)	(138)
Derivative assets and liabilities, net	67	75	19
Net change in operating assets and liabilities, net of effects of acquisitions	$ 36	$ (1,032)	$ (338)

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

No definition available.

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- Definition

The net change during the reporting period in the aggregate market value of financial instruments 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.

+ References

No definition available.

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No definition available.

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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=66902209&loc=d3e3602-108585

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The increase (decrease) during the reporting period in the obligations due for goods and services provided by 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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- Definition

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 amount due to the reporting entity for good and services provided 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 entity's management, an entity and its principal owners, management, member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

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- Definition

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 expenses incurred but not yet paid.

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Amount of increase (decrease) in current assets classified as other.

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No definition available.

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Amount of increase (decrease) in noncurrent assets classified as other.

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Amount of increase (decrease) in noncurrent operating liabilities classified as other.

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No definition available.

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