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Fair Value of Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended
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Mar. 31, 2013
Fair Value Of Financial Instruments 1 | 0
Fair Value Of Financial Instruments 2 | $ 11
Fair Value Of Financial Instruments 3 | 3
Fair Value Of Financial Instruments 4 | $ 11

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