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Total Other Non-Operating Expense (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 13, 2014 | Jul. 02, 2014 | Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Other Nonoperating Income (Expense) [Line Items] |  |  |  |  |  |
Other Nonoperating Expense |  |  |  | $ 0 | $ 128 | $ 129
Entek |  |  |  |  |  |
Schedule of Other Nonoperating Income (Expense) [Line Items] |  |  |  |  |  |
Investment In Affiliate Ownership Percentage Sold |  |  |  |  | 49.62% |
Equity Method Investment, Purchase Price Agreement | $ 125 |  |  |  | $ 125 |
Equity Method Investment, Other than Temporary Impairment | $ 68 |  | $ 18 |  | 86 |
Other Nonoperating Expense |  |  |  |  | 86 | 0
Silver Ridge Power |  |  |  |  |  |
Schedule of Other Nonoperating Income (Expense) [Line Items] |  |  |  |  |  |
Equity Method Investment, Purchase Price Agreement |  | $ 179 |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  |  | 42 |
Equity Method Investment, Ownership Percentage Sold |  | 50.00% |  |  |  |
Equity Method Investment, Net Sales Proceeds |  | $ 179 |  |  |  |
Other Nonoperating Expense |  |  |  |  | 42 | 0
Elsta |  |  |  |  |  |
Schedule of Other Nonoperating Income (Expense) [Line Items] |  |  |  |  |  |
Equity Method Investment, Other than Temporary Impairment |  |  |  |  |  | 129
Other Nonoperating Expense |  |  |  |  | $ 0 |
Equity Method Investments |  |  |  |  |  | 240
Equity Method Investments, Fair Value Disclosure |  |  |  |  |  | $ 111

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