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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