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 -Number 210
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 -Paragraph 22
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 -Number 210
 -Section 02
 -Paragraph 22
 -Article 5

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12/31/2010
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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 22
 -Article 5

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12/31/2010
USD ($)
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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 22
 -Article 5

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{us-gaap_DebtInstrumentAxis} : 5.41% Series O due July 2012 [Member]
12/31/2010
USD ($)
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 -Publisher SEC
 -Name Regulation S-X (SX)
 -Number 210
 -Section 02
 -Paragraph 22
 -Article 5

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{us-gaap_DebtInstrumentAxis} : 5.69% Series E due July 2014 [Member]
12/31/2010
USD ($)
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 -Number 210
 -Section 02
 -Paragraph 22
 -Article 5

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{us-gaap_DebtInstrumentAxis} : 6.29% Series F due September 2013 [Member]
12/31/2010
USD ($)
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