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Early Plant Retirements Early Plant Retirements (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Assets |  | $ 42,716 | $ 40,070 | $ 37,535
Asset Retirement Obligations, Noncurrent |  | 1,024 | 726 |
Power [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Assets |  | 12,418 | 12,193 |
Asset Retirement Obligations, Noncurrent |  | 810 | 511 |
Power [Member] | Energy Costs [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Coal Inventory Lower of Cost or Market Adjustments and Capacity Penalties |  | 15 | 62 |
Power [Member] | Operation and Maintenance Expense [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  | 23 | 53 |
Power [Member] | Depreciation And Amortization [Domain] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Depreciation, including Asset Retirement Costs |  | 964 | $ 571 |
Nuclear Support Facilities [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Public Utilities, Inventory | [1] | 0 |  |
Nuclear Production, Net of Accumulated Depreciation | [1] | 211 |  |
Nuclear Fuel, Net of Accumulated Depreciation | [1] | 0 |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | [1] | 1 |  |
Total Assets | [1] | 212 |  |
Asset Retirement Obligations, Noncurrent | [1] | 0 |  |
Liabilities | [1] | 0 |  |
Net Assets | [1] | 212 |  |
Peach Bottom [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Public Utilities, Inventory |  | 41 |  |
Nuclear Production, Net of Accumulated Depreciation |  | 802 |  |
Nuclear Fuel, Net of Accumulated Depreciation |  | 153 |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress |  | 25 |  |
Total Assets |  | 1,021 |  |
Asset Retirement Obligations, Noncurrent |  | 205 |  |
Liabilities |  | 205 |  |
Net Assets |  | $ 816 |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  | 50.00% |  |
Peach Bottom [Member] | Power [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  | 50.00% |  |
Salem [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Public Utilities, Inventory |  | $ 78 |  |
Nuclear Production, Net of Accumulated Depreciation |  | 661 |  |
Nuclear Fuel, Net of Accumulated Depreciation |  | 124 |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress |  | 90 |  |
Total Assets |  | 953 |  |
Asset Retirement Obligations, Noncurrent |  | 249 |  |
Liabilities |  | 249 |  |
Net Assets |  | $ 704 |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  | 57.00% |  |
Salem [Member] | Power [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  | 57.00% |  |
Hope Creek [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Public Utilities, Inventory |  | $ 86 |  |
Nuclear Production, Net of Accumulated Depreciation |  | 605 |  |
Nuclear Fuel, Net of Accumulated Depreciation |  | 104 |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress |  | 245 |  |
Total Assets |  | 1,040 |  |
Asset Retirement Obligations, Noncurrent |  | 302 |  |
Liabilities |  | 302 |  |
Net Assets |  | $ 738 |  |
Jointly Owned Utility Plant, Proportionate Ownership Share |  | 100.00% |  |
[1] | Includes Hope Creek’s and Salem’s shared support facilities and other nuclear development capital.

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