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Fair Value Measurements - Quantative Information about Level 3 Fair Value (Details) | 3 Months Ended
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Sep. 30, 2015
Discounted Cash Flow | Illiquidity Premium | Auction rate securities |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 3.00%
Fair Value Measurement Range, Maximum | 4.00%
Discounted Cash Flow | Counterparty Credit Spread | Auction rate securities |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 1.00%
Fair Value Measurement Range, Maximum | 2.00%
Discounted Cash Flow | Time To Principal Recovery | Auction rate securities |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range Min, Term | 8 years
Fourth Quarter of 2015 | Option Model | Implied Volatility | Fuel derivatives |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 21.00%
Fair Value Measurement Range, Maximum | 41.00%
2016 | Option Model | Implied Volatility | Fuel derivatives |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 24.00%
Fair Value Measurement Range, Maximum | 41.00%
2017 | Option Model | Implied Volatility | Fuel derivatives |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 22.00%
Fair Value Measurement Range, Maximum | 34.00%
2018 | Option Model | Implied Volatility | Fuel derivatives |
Quantitative Information About Level 3 [Line Items] |
Fair Value Measurement Range, Minimum | 16.00%
Fair Value Measurement Range, Maximum | 29.00%

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