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Other Non-Operating Expense Silver Ridge (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 3 Months Ended | 0 Months Ended |
--- | --- | --- | --- | ---
Jun. 16, 2014 Silver Ridge Power [Member] | Jun. 30, 2014 Silver Ridge Power [Member] | Jul. 02, 2014 Silver Ridge Power [Member] Subsequent Event [Member] | Jun. 16, 2014 Silver Ridge - Italy [Member] | Jun. 30, 2014 Silver Ridge - Italy [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |  | 50.00%
Equity Method Investment, Purchase Price Agreement | $ 165 |  |  | $ 42 |
Equity Method Investment, Other than Temporary Impairment |  | 44 |  |  |
Equity Method Investment, Ownership Percentage Sold |  | 50.00% |  |  |
Equity Method Investment, Net Sales Proceeds |  |  | $ 179 |  |

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- Definition This item represents the amount of net sales proceeds received on disposal of an equity method investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=7658923&loc=d3e32847-111569 + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=7658923&loc=d3e32787-111569 + Details
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