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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Accounts receivable	$ 541	$ (948)	$ (1,126)
Accounts receivable from related companies	162	24	42
Inventories	282	58	(480)
Other current assets	(7)	(38)	(165)
Other non-current assets, net	(92)	84	(148)
Accounts payable	(766)	712	1,170
Accounts payable to related companies	(202)	(178)	(64)
Accrued and other current liabilities	382	(97)	89
Other non-current liabilities	28	106	106
Derivative assets and liabilities, net	(53)	9	67
Net change in operating assets and liabilities, net of effects of acquisitions	$ 289	$ (192)	$ (179)

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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.

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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.

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

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

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