v2.4.0.6

Debt - Long-Term Debt (Parenthetical) (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010
9.375% Notes due 2011 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 9.375% | 9.375%
9.125% Debentures due 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 9.125% | 9.125%
8.20% Debentures due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 8.20% | 8.20%
8.125% Notes due 2030 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 8.125% | 8.125%
7.9% Debentures due 2047 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 7.90% | 7.90%
7.8% Debentures due 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 7.80% | 7.80%
7.68% Notes due 2012 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 7.68% | 7.68%
7.65% Debentures due 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 7.65% | 7.65%
7.625% Debentures due 2013 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 7.625% | 7.625%
7.40% Notes due 2031 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 7.40% | 7.40%
7.375% Debentures due 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 7.375% | 7.375%
7.25% Notes due 2031 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 7.25% | 7.25%
7.20% Notes due 2031 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 7.20% | 7.20%
7% Debentures due 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 7.00% | 7.00%
6.95% Notes due 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 6.95% | 6.95%
6.875% Debentures due 2026 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 6.875% | 6.875%
6.65% Debentures due 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 6.65% | 6.65%
6.50% Notes due 2011 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 6.50% | 6.50%
6.50% Notes due 2039 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 6.50% | 6.50%
6.50% Notes due 2039 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 6.50% | 6.50%
6.00% Notes due 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 6.00% | 6.00%
5.951% Notes due 2037 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 5.951% | 5.951%
5.95% Notes due 2036 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 5.95% | 5.95%
5.90% Notes due 2032 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 5.90% | 5.90%
5.90% Notes due 2038 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 5.90% | 5.90%
5.75% Notes due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 5.75% | 5.75%
5.625% Notes due 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 5.625% | 5.625%
5.50% Notes due 2013 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 5.50% | 5.50%
5.20% Notes due 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 5.20% | 5.20%
4.75% Notes due 2012 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 4.75% | 4.75%
4.75% Notes due 2014 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 4.75% | 4.75%
4.60% Notes due 2015 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 4.60% | 4.60%
4.40% Notes due 2013 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 4.40% | 4.40%
Commercial Paper [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt minimum | 0.34% | 0.14%
Stated percentage of debt maximum | 0.341% | 0.34%
Industrial Development Bonds due 2012 through 2038 at 0.08% - 5.75% at year-end 2011 and 0.33% - 5.75% at year-end 2010 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt minimum | 0.08% | 0.33%
Stated percentage of debt maximum | 5.75% | 5.75%
Guarantee of savings plan bank loan payable due 2015 at 2.29% at year-end 2011 and 2.06% at year-end 2010 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 2.29% | 2.06%
Note payable to Merey Sweeny, L.P. due 2020 at 7% (related party) [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt | 7.00% | 7.00%
Marine Terminal Revenue Refunding Bonds due 2031 at 0.08% - 0.15% at year-end 2011 and 0.33% - 0.48% at year-end 2010 [Member] |  |
Debt Instrument [Line Items] |  |
Stated percentage of debt minimum | 0.08% | 0.33%
Stated percentage of debt maximum | 0.15% | 0.48%

X
- Definition Interest rate stated in the contractual debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition When presenting a range of interest rates, the highest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition When presenting a range of interest rates, the lowest stated (contractual) rate for funds borrowed under the debt agreement as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration