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