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Early Plant Retirements Early Plant Retirements (Details) - Power [Member] - USD ($) $ in Millions | 5 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2017 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |
Total Pre-Tax Restructuring Costs |  |  | $ 686
Energy Costs [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Coal Inventory Lower of Cost or Market Adjustments and Capacity Penalties |  |  | 62
Operation and Maintenance Expense [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Materials and Supplies Obsolescence |  |  | 31
Write-down of Construction Work in Progress |  |  | 14
Other | [1] |  | 8
Depreciation And Amortization [Domain] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Depreciation, including Asset Retirement Costs |  |  | $ 571
Subsequent Event [Member] | Depreciation And Amortization [Domain] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Depreciation, including Asset Retirement Costs |  | $ 958 |
[1] | Includes severance and miscellaneous costs. Power recorded $7 million of severance expense which it expects to pay in 2017.

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