Commitments and Contingencies (Details 3) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2011 Y D bbl Segments InterestRateSwaps	Dec. 31, 2010
Environmental
Estimated environmental reserve	$ 122	$ 66
Reserve for environmental liabilities, short-term	64	10
Reserve for environmental liabilities, long-term	58	56
Probable recoveries from insurers and third parties recorded as a receivable	64	5
Actual cash expenditures for environmental liabilities, period paid, low end of range (in years)	3
Actual cash expenditures for environmental liabilities, period paid, high end of range (in years)	5
Insurance
Premium and deductible as a percentage of coverage limit (as a percent)	20.00%
Number of years over which hurricane limit insurance is purchased (in years)	2
Hurricane property and business interruption insurance limit	$ 10

The high end of the range of the estimated period of time when actual cash expenditures are made for environmental liabilities, as stated in years.

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- Definition

The low end of the range of the estimated period of time when actual cash expenditures are made for environmental liabilities, as stated in years.

+ Details

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- Definition

Amount of insurance to cover property and business interruption losses associated with hurricane damage.

+ Details

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- Details

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- Definition

Represents number of years over which hurricane limit insurance is purchased which covers property and business interruption.

+ Details

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- Definition

Amount of premiums plus deductibles as percentage of coverage limit.

+ Details

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- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 96-1
-Paragraph 161
-Subparagraph a

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9

+ Details

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- Definition

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 96-1
-Paragraph 161, 163

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20
-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 3
-Section A
-Paragraph 8

+ Details

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- Definition

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 24
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 96-1
-Paragraph 161, 163

+ Details

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- Details

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- Definition

Carrying amount as of the balance sheet date of known and reasonably estimable amounts of recoveries from third-parties pertaining to an entity's environmental remediation obligations. An entity's balance sheet may include several assets that relate to an environmental remediation obligation. Among them are the following: a. Receivables from other potentially responsible parties that are not providing initial funding; b. anticipated recoveries from insurers; and c. anticipated recoveries from prior owners as a result of indemnification agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 96-1
-Paragraph 161

+ Details

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