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Early Plant Retirements Early Plant Retirements (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Early Plant Retirements [Line Items] |  |  |  |  |  |
Total Assets |  | $ 43,707 |  | $ 43,707 |  | $ 42,716
Asset Retirement Obligations |  | 1,047 |  | 1,047 |  | 1,024
Power [Member] |  |  |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |  |  |
Total Assets |  | 12,772 |  | 12,772 |  | 12,418
Asset Retirement Obligations |  | 831 |  | 831 |  | $ 810
Power [Member] | Energy Costs [Member] |  |  |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |  |  |
Coal Inventory Lower of Cost or Market Adjustments |  | (1) | $ 2 | 3 | $ 9 |
Power [Member] | Operation and Maintenance Expense [Member] |  |  |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |  |  |
Restructuring Charges |  |  |  |  | 4 |
Power [Member] | Depreciation And Amortization [Domain] |  |  |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |  |  |
Accelerated Depreciation including Asset Retirement Costs |  |  | $ 390 |  | $ 964 |
Hope Creek [Member] |  |  |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |  |  |
Materials and Supplies Inventory |  | 83 |  | 83 |  |
Nuclear Production, net of Accumulated Depreciation |  | 688 |  | 688 |  |
Nuclear Fuel In-Service, net of Accumulated Depreciation |  | 171 |  | 171 |  |
Construction Work in Progress (including nuclear fuel) |  | 140 |  | 140 |  |
Total Assets |  | 1,082 |  | 1,082 |  |
Asset Retirement Obligations |  | 309 |  | 309 |  |
Total Liabilities |  | 309 |  | 309 |  |
Net Assets |  | $ 773 |  | $ 773 |  |
% Owned |  | 100.00% |  | 100.00% |  |
Nuclear Support Facilities [Member] |  |  |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |  |  |
Materials and Supplies Inventory | [1] | $ 0 |  | $ 0 |  |
Nuclear Production, net of Accumulated Depreciation | [1] | 203 |  | 203 |  |
Nuclear Fuel In-Service, net of Accumulated Depreciation | [1] | 0 |  | 0 |  |
Construction Work in Progress (including nuclear fuel) | [1] | 2 |  | 2 |  |
Total Assets | [1] | 205 |  | 205 |  |
Asset Retirement Obligations | [1] | 0 |  | 0 |  |
Total Liabilities | [1] | 0 |  | 0 |  |
Net Assets | [1] | 205 |  | 205 |  |
Salem [Member] |  |  |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |  |  |
Materials and Supplies Inventory |  | 82 |  | 82 |  |
Nuclear Production, net of Accumulated Depreciation |  | 646 |  | 646 |  |
Nuclear Fuel In-Service, net of Accumulated Depreciation |  | 89 |  | 89 |  |
Construction Work in Progress (including nuclear fuel) |  | 105 |  | 105 |  |
Total Assets |  | 922 |  | 922 |  |
Asset Retirement Obligations |  | 255 |  | 255 |  |
Total Liabilities |  | 255 |  | 255 |  |
Net Assets |  | $ 667 |  | $ 667 |  |
% Owned |  | 57.00% |  | 57.00% |  |
Peach Bottom [Member] |  |  |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |  |  |
Materials and Supplies Inventory |  | $ 42 |  | $ 42 |  |
Nuclear Production, net of Accumulated Depreciation |  | 786 |  | 786 |  |
Nuclear Fuel In-Service, net of Accumulated Depreciation |  | 119 |  | 119 |  |
Construction Work in Progress (including nuclear fuel) |  | 24 |  | 24 |  |
Total Assets |  | 971 |  | 971 |  |
Asset Retirement Obligations |  | 210 |  | 210 |  |
Total Liabilities |  | 210 |  | 210 |  |
Net Assets |  | $ 761 |  | $ 761 |  |
% Owned |  | 50.00% |  | 50.00% |  |
[1] | Includes Hope Creek’s and Salem’s shared support facilities and other nuclear development capital.

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