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Early Plant Retirements Early Plant Retirements (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Early Plant Retirements [Line Items] |  |  |  |
Total Assets |  | $ 41,157 | $ 41,157 | $ 40,070
Asset Retirement Obligations |  | 748 | 748 | 726
Power [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Total Assets |  | 11,631 | 11,631 | 12,193
Asset Retirement Obligations |  | 530 | 530 | 511
Power [Member] | Energy Costs [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Coal Inventory Lower of Cost or Market Adjustments |  | 1 | 10 | 62
Power [Member] | Operating Expense [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Operation and Maintenance charges |  | 8 | 12 | 53
Power [Member] | Depreciation And Amortization [Domain] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Accelerated Depreciation including Asset Retirement Costs |  |  | 964 | $ 571
Hope Creek [Member] | Nuclear Plant [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Materials and Supplies Inventory |  | 85 | 85 |
Nuclear Production, net of Accumulated Depreciation |  | 452 | 452 |
Nuclear Fuel In-Service, net of Accumulated Depreciation |  | 120 | 120 |
Construction Work in Progress (including nuclear fuel) |  | 216 | 216 |
Total Assets |  | 873 | 873 |
Asset Retirement Obligations |  | 148 | 148 |
Total Liabilities |  | 148 | 148 |
Net Assets |  | $ 725 | $ 725 |
% Owned |  | 100.00% | 100.00% |
Salem [Member] | Nuclear Plant [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Materials and Supplies Inventory |  | $ 81 | $ 81 |
Nuclear Production, net of Accumulated Depreciation |  | 557 | 557 |
Nuclear Fuel In-Service, net of Accumulated Depreciation |  | 94 | 94 |
Construction Work in Progress (including nuclear fuel) |  | 130 | 130 |
Total Assets |  | 862 | 862 |
Asset Retirement Obligations |  | 162 | 162 |
Total Liabilities |  | 162 | 162 |
Net Assets |  | $ 700 | $ 700 |
% Owned |  | 57.00% | 57.00% |
Nuclear Support Facilities [Member] | Nuclear Plant [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Materials and Supplies Inventory | [1] | $ 0 | $ 0 |
Nuclear Production, net of Accumulated Depreciation | [1] | 204 | 204 |
Nuclear Fuel In-Service, net of Accumulated Depreciation | [1] | 0 | 0 |
Construction Work in Progress (including nuclear fuel) | [1] | 9 | 9 |
Total Assets | [1] | 213 | 213 |
Asset Retirement Obligations | [1] | 0 | 0 |
Total Liabilities | [1] | 0 | 0 |
Net Assets | [1] | $ 213 | $ 213 |
% Owned | [1] | 0.00% | 0.00% |
Peach Bottom [Member] | Nuclear Plant [Member] |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |
Materials and Supplies Inventory |  | $ 41 | $ 41 |
Nuclear Production, net of Accumulated Depreciation |  | 753 | 753 |
Nuclear Fuel In-Service, net of Accumulated Depreciation |  | 109 | 109 |
Construction Work in Progress (including nuclear fuel) |  | 92 | 92 |
Total Assets |  | 995 | 995 |
Asset Retirement Obligations |  | 164 | 164 |
Total Liabilities |  | 164 | 164 |
Net Assets |  | $ 831 | $ 831 |
% 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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