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Debt, Non-Bank Debt and Capitalized Interest (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 1 Months Ended |  | 0 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Jan. 31, 2013 Senior Notes Due In 2013 [Member] | Mar. 31, 2012 Tax Exempt Revenue Refunding Bonds Series 1997A [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 | $ 180 | $ 0 | $ 180 |  |  |  |  |  | $ 108
Interest rate of notes in percentage |  |  | 6.70% | 5.45% | 5.60% | 5.60% | 5.70% | 6.65% |
Redemption value in percentage |  |  |  |  |  |  |  |  | 100.00%
Capitalized Interest (Textual) |  |  |  |  |  |  |  |  |
Interest costs incurred, capitalized | $ 40 | $ 52 |  |  |  |  |  |  |

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