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Debt, Non-Bank Debt (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  | 0 Months Ended | 1 Months Ended |  |  |  |  | 1 Months Ended |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended |  | 1 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2011 Tax Exempt Revenue Refunding Bonds Series 1997B [Member] | Apr. 30, 2011 Tax Exempt Revenue Refunding Bonds Series 1997B [Member] | Apr. 30, 2010 Tax Exempt Revenue Refunding Bonds Series 1997B [Member] | May 03, 2012 Industrial Revenue Bonds Tax Exempt Refunding Bonds [Member] | Dec. 31, 2011 Industrial Revenue Bonds Tax Exempt Refunding Bonds [Member] | Apr. 30, 2011 Industrial Revenue Bonds Tax Exempt Refunding Bonds [Member] | Apr. 30, 2010 Industrial Revenue Bonds Tax Exempt Refunding Bonds [Member] | May 31, 2011 Senior Notes Due In May 2011 [Member] | Apr. 30, 2012 Tax Exempt Revenue Refunding Bonds Series 1997A [Member] | Dec. 31, 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, 2010 Tax Exempt Revenue Refunding Bonds Series 1997A [Member] | Apr. 30, 2012 Notes Due In 2012 [Member] | Dec. 31, 2012 Notes Due In 2012 [Member] | Dec. 31, 2012 Tax Exempt Waste Disposal Revenue Bonds Series 1997 [Member] | Mar. 31, 2012 Tax Exempt Waste Disposal Revenue Bonds Series 1997 [Member] | Dec. 31, 2012 Tax Exempt Waste Disposal Revenue Bonds Series 1998 [Member] | Mar. 31, 2012 Tax Exempt Waste Disposal Revenue Bonds Series 1998 [Member] | Dec. 31, 2012 Tax Exempt Waste Disposal Revenue Bonds Series 1999 [Member] | Mar. 31, 2012 Tax Exempt Waste Disposal Revenue Bonds Series 1999 [Member] | Dec. 31, 2012 Tax Exempt Waste Disposal Revenue Bonds Series 2001 [Member] | Mar. 31, 2012 Tax Exempt Waste Disposal Revenue Bonds Series 2001 [Member] | Dec. 31, 2011 Tax Exempt Revenue Refunding Bonds Series 1997C [Member] | Apr. 30, 2011 Tax Exempt Revenue Refunding Bonds Series 1997C [Member] | Apr. 30, 2010 Tax Exempt Revenue Refunding Bonds Series 1997C [Member] | Feb. 28, 2011 Senior Notes Due In February 2011 [Member] | Jun. 30, 2012 Gulf Opportunity Zone Revenue Bonds Series 2010 [Member] | Feb. 28, 2011 Gulf Opportunity Zone Revenue Bonds Series 2010 [Member] | Dec. 31, 2010 Gulf Opportunity Zone Revenue Bonds Series 2010 [Member] | Dec. 31, 2012 Gulf Opportunity Zone Revenue Bonds Series 2010 [Member] | Dec. 31, 2011 Gulf Opportunity Zone Revenue Bonds Series 2010 [Member] | Mar. 31, 2010 Senior Notes Due In June 2015 [Member] | Feb. 28, 2010 Notes Due In February 2015 [Member] | Dec. 31, 2012 Notes Due In February 2015 [Member] | Feb. 28, 2010 Notes Due In February 2020 [Member] | Dec. 31, 2012 Notes Due In February 2020 [Member] | Feb. 28, 2010 Notes Issued In February 2010 [Member] | Dec. 31, 2010 Gulf Opportunity Zone Revenue Bonds Series 2010 [Member] | Jun. 30, 2010 Debenture Due In June 2010 [Member] | May 31, 2010 Senior Notes Due In May 2014 [Member]
Non-Bank Debt (Textual) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from advances for construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of notes in percentage |  |  |  | 5.40% | 5.40% | 5.40% |  |  |  |  | 6.125% | 5.45% | 5.45% | 5.45% | 5.45% | 5.45% | 6.875% | 6.875% | 5.60% | 5.60% | 5.60% | 5.60% | 5.70% | 5.70% | 6.65% | 6.65% | 5.40% | 5.40% | 5.40% | 6.75% | 4.00% |  |  | 4.00% |  | 7.50% | 4.50% | 4.50% | 6.125% | 6.125% |  |  | 7.25% | 6.75%
Debt instrument maturity date (month, day, year) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 01, 2040 |  |  |  |  | Jun. 15, 2015 | Feb. 01, 2015 |  | Feb. 01, 2020 |  |  | Dec. 01, 2040 |  | May 01, 2014
Debt instrument, mandatory tender date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 01, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt repayments | 862 | 774 | 517 |  |  |  | 108 | 56 | 8 | 8 | 200 | 4 |  |  |  |  | 750 |  |  |  |  |  |  |  |  |  |  |  |  | 210 |  | 300 |  |  |  | 294 |  |  |  |  |  |  | 25 | 190
Redemption value in percentage |  |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 102.50% |  |  |  |  |  |  |  | 102.25%
Revenue bond |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300 | 0 |  |  |  |  |  |  | 300 |  |
Proceeds from debt, net of issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300 |  |  |  |  |  |  |  | 1,200 |  |  |
Notes issued, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400 |  | $ 850 |  |  |  |  |

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- Definition The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16, 20 -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 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
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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 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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