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Early Plant Retirements Early Plant Retirements (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Early Plant Retirements [Line Items] |  |  |  |
Total Assets |  | $ 42,790 |  | $ 42,716
Asset Retirement Obligations |  | 1,037 |  | 1,024
Power [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Total Assets |  | 12,263 |  | 12,418
Asset Retirement Obligations |  | 821 |  | $ 810
Power [Member] | Energy Costs [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Coal Inventory Lower of Cost or Market Adjustments |  | 4 | $ 7 |
Power [Member] | Depreciation And Amortization [Domain] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Accelerated Depreciation including Asset Retirement Costs |  |  | $ 574 |
Hope Creek [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Materials and Supplies Inventory |  | 84 |  |
Nuclear Production, net of Accumulated Depreciation |  | 602 |  |
Nuclear Fuel In-Service, net of Accumulated Depreciation |  | 88 |  |
Construction Work in Progress (including nuclear fuel) |  | 296 |  |
Total Assets |  | 1,070 |  |
Asset Retirement Obligations |  | 305 |  |
Total Liabilities |  | 305 |  |
Net Assets |  | $ 765 |  |
% Owned |  | 100.00% |  |
Nuclear Support Facilities [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Materials and Supplies Inventory | [1] | $ 0 |  |
Nuclear Production, net of Accumulated Depreciation | [1] | 207 |  |
Nuclear Fuel In-Service, net of Accumulated Depreciation | [1] | 0 |  |
Construction Work in Progress (including nuclear fuel) | [1] | 1 |  |
Total Assets | [1] | 208 |  |
Asset Retirement Obligations | [1] | 0 |  |
Total Liabilities | [1] | 0 |  |
Net Assets | [1] | 208 |  |
Salem [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Materials and Supplies Inventory |  | 83 |  |
Nuclear Production, net of Accumulated Depreciation |  | 653 |  |
Nuclear Fuel In-Service, net of Accumulated Depreciation |  | 107 |  |
Construction Work in Progress (including nuclear fuel) |  | 97 |  |
Total Assets |  | 940 |  |
Asset Retirement Obligations |  | 252 |  |
Total Liabilities |  | 252 |  |
Net Assets |  | $ 688 |  |
% Owned |  | 57.00% |  |
Peach Bottom [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Materials and Supplies Inventory |  | $ 41 |  |
Nuclear Production, net of Accumulated Depreciation |  | 797 |  |
Nuclear Fuel In-Service, net of Accumulated Depreciation |  | 136 |  |
Construction Work in Progress (including nuclear fuel) |  | 20 |  |
Total Assets |  | 994 |  |
Asset Retirement Obligations |  | 207 |  |
Total Liabilities |  | 207 |  |
Net Assets |  | $ 787 |  |
% Owned |  | 50.00% |  |
[1] | Includes Hope Creek’s and Salem’s shared support facilities and other nuclear development capital.

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