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Operating Segments, Geographic Analysis and Major Customers (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 item	Dec. 31, 2012	Dec. 31, 2011
Operating Segments, Geographic Analysis and Major Customers
Number of operating segments									2
Operating segments, geographical analysis and major customers
Operating revenues	$ 2,332	$ 2,558	$ 2,397	$ 2,197	$ 2,326	$ 2,431	$ 2,329	$ 2,110	$ 9,484	$ 9,196	$ 8,027
U.S.
Operating segments, geographical analysis and major customers
Operating revenues									2,382	2,472	1,971
Norway
Operating segments, geographical analysis and major customers
Operating revenues									1,208	1,174	897
U.K.
Operating segments, geographical analysis and major customers
Operating revenues									1,181	1,028	1,099
Brazil
Operating segments, geographical analysis and major customers
Operating revenues									855	1,114	1,019
Other countries
Operating segments, geographical analysis and major customers
Operating revenues									$ 3,858	$ 3,408	$ 3,041

X

- 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.

+ 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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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