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Debt (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  | 0 Months Ended | 1 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2012 | Mar. 31, 2011 | 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, 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] | Feb. 28, 2011 Senior Notes Due In February 2011 [Member] | Feb. 28, 2011 Gulf Opportunity Zone Revenue Bonds Series 2010 [Member]
Non-Bank Debt (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Debt repayments | $ 0 | $ 510 |  |  |  |  | $ 108 | $ 4 |  | $ 750 | $ 210 | $ 300
Interest rate of notes in percentage |  |  | 5.60% | 5.60% | 5.70% | 6.65% |  | 5.45% | 5.45% | 6.875% | 6.75% |
Redemption value in percentage |  |  |  |  |  |  | 100.00% |  |  |  |  |
Capitalized Interest (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Interest costs incurred, capitalized | $ 52 | $ 27 |  |  |  |  |  |  |  |  |  |

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- Definition Total interest costs incurred during the period that are capitalized. + 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + 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=6943989&loc=d3e3291-108585 Reference 2: 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 3: 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. Reference 4: 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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