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Description Of Company And Significant Accounting Policies (Schedule Of Revenue And Receivables From Major Customers) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue, Major Customer [Line Items]
Revenue	$ 1,080	$ 1,199	$ 1,381	$ 1,436	$ 1,417	$ 1,657	$ 1,659	$ 1,633	$ 5,096	$ 6,366	$ 7,214
Chevron [Member]
Revenue, Major Customer [Line Items]
Revenue									$ 523	$ 1,069	$ 1,859
Revenue percentage									10.00%	17.00%	26.00%
Receivables percentage									5.00%	9.00%	13.00%

X

- Definition

Percentage of accounts receivable

+ References

No definition available.

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- Definition

Percentage Of Revenues

+ References

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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.

+ References

No definition available.

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- Definition

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).

+ 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 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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