Additional Financial Statement Information (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Paid During the Year For [Abstract]
Interest, Net of Amount Capitalized	$ 189us-gaap_InterestPaidNet	$ 137us-gaap_InterestPaidNet	$ 107us-gaap_InterestPaidNet
Income Taxes Paid, Net	150us-gaap_IncomeTaxesPaidNet	165us-gaap_IncomeTaxesPaidNet	168us-gaap_IncomeTaxesPaidNet
Non-Cash Financing and Investing Activities [Abstract]
Increase in FPSO Lease Obligation	$ 110us-gaap_CapitalLeaseObligationsIncurred	$ 96us-gaap_CapitalLeaseObligationsIncurred	$ 0us-gaap_CapitalLeaseObligationsIncurred

The increase during the period in capital lease obligations due to entering into new capital leases.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

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- Definition

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

+ References

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