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Early Plant Retirements Early Plant Retirements (Details) - Power [Member] - USD ($) $ in Millions | 3 Months Ended | 5 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | May 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Pre-Tax Expense |  |  | $ 114 |
Energy Costs [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Coal Inventory Lower of Cost or Market Adjustments and Capacity Penalties |  |  | 62 |
Operating Expense [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Materials and Supplies Obsolescence |  |  | 31 |
Write-Down of Construction Work in Progress |  |  | 14 |
Other | [1] |  | 3 |
Depreciation And Amortization [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Accelerated Depreciation including Asset Retirement Costs |  |  | $ 4 |
Subsequent Event [Member] | Depreciation And Amortization [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Accelerated Depreciation including Asset Retirement Costs |  | $ 568 |  | $ 946
[1] | Includes severance and miscellaneous costs.

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