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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
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