Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Long-term debt instruments	$ 4,101	$ 5,636
Debt due within one year	(17)	(33)
Reclassified from Short-Term Debt	5,600	5,400
Total Long-Term Debt	9,684	11,003
Long-Term Debt (Textual) [Abstract]
Total Long-Term Debt	9,684	11,003
Long-term debt instruments	4,101	5,636
Long-term debt maturing 2012	17
Long-term debt maturing 2013	20
Long-term debt maturing 2014	2,021
Long-term debt maturing 2015	0
Long-term debt maturing 2016	0
Long-term debt maturing after 2016	2,043
Total bonds redeemed in 2011	1,500
Tax Exempt Bond Issued Pascagoula Refinery	374
Texaco Capital Inc Bonds Matured in 2010		30
3.95% notes due 2014 [Member]
Debt Instrument [Line Items]
Long-term debt instruments	1,998	1,998
Long-Term Debt (Textual) [Abstract]
Long-term debt instruments	1,998	1,998
3.45% notes due 2012 [Member]
Debt Instrument [Line Items]
Long-term debt instruments	0	1,500
Long-Term Debt (Textual) [Abstract]
Long-term debt instruments	0	1,500
4.95% notes due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt instruments	1,500	1,500
Long-Term Debt (Textual) [Abstract]
Long-term debt instruments	1,500	1,500
8.625% debentures due 2032 [Member]
Debt Instrument [Line Items]
Long-term debt instruments	147	147
Long-Term Debt (Textual) [Abstract]
Long-term debt instruments	147	147
8.625 % debentures due 2031 [Member]
Debt Instrument [Line Items]
Long-term debt instruments	107	107
Long-Term Debt (Textual) [Abstract]
Long-term debt instruments	107	107
7.5 % debentures due 2043 [Member]
Debt Instrument [Line Items]
Long-term debt instruments	83	83
Long-Term Debt (Textual) [Abstract]
Long-term debt instruments	83	83
8 % debentures due 2032 [Member]
Debt Instrument [Line Items]
Long-term debt instruments	74	74
Long-Term Debt (Textual) [Abstract]
Long-term debt instruments	74	74
7.327% amortizing notes due 2014 [Member]
Debt Instrument [Line Items]
Long-term debt instruments	59	72
Long-Term Debt (Textual) [Abstract]
Long-term debt instruments	59	72
9.75 % debentures due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt instruments	54	54
Long-Term Debt (Textual) [Abstract]
Long-term debt instruments	54	54
8.875 % debentures due 2021 [Member]
Debt Instrument [Line Items]
Long-term debt instruments	40	40
Long-Term Debt (Textual) [Abstract]
Long-term debt instruments	40	40
Medium-term notes, maturing from 2021 to 2038 (6.02%) [Member]
Debt Instrument [Line Items]
Long-term debt instruments	38	38
Long-Term Debt (Textual) [Abstract]
Long-term debt instruments	38	38
Fixed interest rate notes, maturing 2011(9.378%) [Member]
Debt Instrument [Line Items]
Long-term debt instruments	0	19
Long-Term Debt (Textual) [Abstract]
Long-term debt instruments	0	19
Other long-term debt (8.07%) [Member]
Debt Instrument [Line Items]
Long-term debt instruments	1	4
Long-Term Debt (Textual) [Abstract]
Long-term debt instruments	$ 1	$ 4

Bonds matured.

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Debt redeemed.

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No definition available.

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- Definition

Tax exempt bond issued project refinery.

+ References

No definition available.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

+ References

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

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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Total of the portions of the carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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-Subparagraph (SX 210.5-02.19,20)

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- Definition

Amount of long-term debt maturities after year five following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 10

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Topic 470

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Amount of long-term debt maturing within the next twelve months following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates.

+ References

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Amount of long-term debt maturing in year five following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

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Amount of long-term debt maturing in year four following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

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Amount of long-term debt maturing in year three following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

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Amount of long-term debt maturing in year two following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates.

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Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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Amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 6

-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Paragraph 4

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