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Risk Management Activities and Fair Value Measurements Risk Management Activities and Fair Value Measurements - Additional Information (Details) (USD $)
In Millions, unless otherwise specified |
Sep. 30, 2014
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Jun. 30, 2014
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|---|---|---|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Long Term Debt, Current Maturities measured at Fair Value | $ 2,651 | $ 4,400 |