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Debt, Non-Bank Debt and Capitalized Interest (Details) (USD $) | 3 Months Ended | 6 Months Ended | 1 Months Ended |  | 1 Months Ended |  | 0 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Notes Due In 2013 [Member] | Jan. 31, 2013 Senior Notes Due In 2013 [Member] | Jun. 30, 2012 Gulf Opportunity Zone Revenue Bonds Series 2010 [Member] | Apr. 30, 2012 Tax Exempt Revenue Refunding Bonds Series 1997A [Member] | Mar. 31, 2012 Tax Exempt Revenue Refunding Bonds Series 1997A [Member] | Apr. 30, 2012 Notes Due In 2012 [Member] | Mar. 31, 2012 Tax Exempt Waste Disposal Revenue Bonds Series 1997 [Member] | Mar. 31, 2012 Tax Exempt Waste Disposal Revenue Bonds Series 1998 [Member] | Mar. 31, 2012 Tax Exempt Waste Disposal Revenue Bonds Series 1999 [Member] | Mar. 31, 2012 Tax Exempt Waste Disposal Revenue Bonds Series 2001 [Member] | May 03, 2012 Industrial Revenue Bonds Tax Exempt Refunding Bonds [Member]
Non-Bank Debt (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repayments |  |  | $ 480,000,000 | $ 862,000,000 | $ 300,000,000 | $ 180,000,000 |  | $ 4,000,000 |  | $ 750,000,000 |  |  |  |  | $ 108,000,000
Interest rate of notes in percentage |  |  |  |  | 4.75% | 6.70% | 4.00% | 5.45% | 5.45% | 6.875% | 5.60% | 5.60% | 5.70% | 6.65% |
Proceeds from Advances for Construction |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  | Dec. 01, 2040 |  |  |  |  |  |  |  |
Debt Instrument, Mandatory Tender Date |  |  |  |  |  |  | Jun. 01, 2022 |  |  |  |  |  |  |  |
Redemption value in percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Capitalized Interest (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest costs incurred, capitalized | $ 45,000,000 | $ 53,000,000 | $ 85,000,000 | $ 105,000,000 |  |  |  |  |  |  |  |  |  |  |

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- Definition Contractual interest rate for funds borrowed, under the 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
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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
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- Definition Percentage of principal amount of debt redeemed. + References No definition available. + Details
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- Definition Amount of interest capitalized, including amount of allowance for funds used during construction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 835 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433 + Details
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- Definition The cash inflow from borrowing by the entity from developers, builders, government agencies and municipalities for construction that are repaid in cash, generally on a straight-line basis over periods ranging from five to forty years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (with maturities initially due after one year or beyond the operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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