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Debt (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 1 Months Ended |  |  | 1 Months Ended |  | 0 Months Ended | 1 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Jun. 30, 2012 Gulf Opportunity Zone Revenue Bonds Series 2010 [Member] | Feb. 28, 2011 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, 2011 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] | Apr. 30, 2011 Industrial Revenue Bonds Tax Exempt Refunding Bonds [Member] | May 31, 2011 Senior Notes Due In May 2011 [Member] | Apr. 30, 2011 Tax Exempt Revenue Refunding Bonds Series 1997B [Member] | Apr. 30, 2011 Tax Exempt Revenue Refunding Bonds Series 1997C [Member] | Feb. 28, 2011 Senior Notes Due In February 2011 [Member]
Non-Bank Debt (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from financing arrangement |  |  |  |  | $ 300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repayments |  |  | 862 | 718 |  | 300 | 4 |  |  | 750 |  |  |  |  | 108 | 8 | 200 |  |  | 210
Interest rate of notes in percentage |  |  |  |  | 4.00% |  | 5.45% | 5.45% | 5.45% | 6.875% | 5.60% | 5.60% | 5.70% | 6.65% |  |  | 6.125% | 5.40% | 5.40% | 6.75%
Debt instrument maturity date (month, day, year) |  |  |  |  | Dec. 01, 2040 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument mandatory tender date |  |  |  |  | Jun. 01, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption value in percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Capitalized Interest (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest costs incurred, capitalized | $ 59 | $ 42 | $ 164 | $ 102 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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. + 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 Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 -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. Reference 2: 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 3: 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=6943989&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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 16 -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. + 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 Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 -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. 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 Reference 3: 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=6943989&loc=d3e3291-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -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. + Details
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