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Early Plant Retirements Early Plant Retirements (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Dec. 31, 2017
Early Plant Retirements [Line Items] |  |  |  |  |
Total Assets |  |  |  | $ 45,073 | $ 42,716
Asset Retirement Obligations |  |  |  | 1,059 | 1,024
Power [Member] |  |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |  |
Total Assets |  |  |  | 12,681 | 12,418
Asset Retirement Obligations |  |  |  | 841 | $ 810
Power [Member] | Energy Costs [Member] |  |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |  |
Coal Inventory Lower of Cost or Market Adjustments |  | $ 1 | $ 10 |  |
Power [Member] | Operation and Maintenance Expense [Member] |  |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |  |
Restructuring Charges |  | $ 8 | 12 |  |
Power [Member] | Depreciation And Amortization [Domain] |  |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |  |
Accelerated Depreciation including Asset Retirement Costs |  |  | $ 964 |  |
Hope Creek [Member] |  |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |  |
Materials and Supplies Inventory |  |  |  | 83 |
Nuclear Production, net of Accumulated Depreciation |  |  |  | 684 |
Nuclear Fuel In-Service, net of Accumulated Depreciation |  |  |  | 155 |
Construction Work in Progress (including nuclear fuel) |  |  |  | 144 |
Total Assets |  |  |  | 1,066 |
Asset Retirement Obligations |  |  |  | 313 |
Total Liabilities |  |  |  | 313 |
Net Assets |  |  |  | $ 753 |
% 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] |  |  | 199 |
Nuclear Fuel In-Service, net of Accumulated Depreciation | [1] |  |  | 0 |
Construction Work in Progress (including nuclear fuel) | [1] |  |  | 2 |
Total Assets | [1] |  |  | 201 |
Asset Retirement Obligations | [1] |  |  | 0 |
Total Liabilities | [1] |  |  | 0 |
Net Assets | [1] |  |  | 201 |
Salem [Member] |  |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |  |
Materials and Supplies Inventory |  |  |  | 72 |
Nuclear Production, net of Accumulated Depreciation |  |  |  | 642 |
Nuclear Fuel In-Service, net of Accumulated Depreciation |  |  |  | 72 |
Construction Work in Progress (including nuclear fuel) |  |  |  | 156 |
Total Assets |  |  |  | 942 |
Asset Retirement Obligations |  |  |  | 258 |
Total Liabilities |  |  |  | 258 |
Net Assets |  |  |  | $ 684 |
% Owned |  |  |  | 57.00% |
Peach Bottom [Member] |  |  |  |  |
Early Plant Retirements [Line Items] |  |  |  |  |
Materials and Supplies Inventory |  |  |  | $ 42 |
Nuclear Production, net of Accumulated Depreciation |  |  |  | 775 |
Nuclear Fuel In-Service, net of Accumulated Depreciation |  |  |  | 103 |
Construction Work in Progress (including nuclear fuel) |  |  |  | 87 |
Total Assets |  |  |  | 1,007 |
Asset Retirement Obligations |  |  |  | 213 |
Total Liabilities |  |  |  | 213 |
Net Assets |  |  |  | $ 794 |
% Owned |  |  |  | 50.00% |
[1] | Includes Hope Creek’s and Salem’s shared support facilities and other nuclear development capital.

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- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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