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Early Plant Retirements Early Plant Retirements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Assets |  | $ 45,326 | $ 42,716 | $ 40,070
Asset Retirement Obligations, Noncurrent |  | 1,063 | 1,024 |
Gain on Sale of Hudson and Mercer |  | 54 | 0 | 0
Power [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total Assets |  | 12,594 | 12,418 |
Asset Retirement Obligations, Noncurrent |  | 758 | 810 |
Gain on Sale of Hudson and Mercer |  | 54 | 0 | 0
Power [Member] | Energy Costs [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Coal Inventory Lower of Cost or Market Adjustments and Capacity Penalties |  | 3 | 15 | 62
Power [Member] | Operation and Maintenance Expense [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  |  | 23 | 53
Power [Member] | Depreciation And Amortization [Member] |  |  |  |
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] | 197 |  |
Nuclear Fuel, Net of Accumulated Depreciation | [1] | 0 |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | [1] | 5 |  |
Total Assets | [1] | 202 |  |
Asset Retirement Obligations, Noncurrent | [1] | 0 |  |
Liabilities | [1] | 0 |  |
Net Assets | [1] | 202 |  |
Peach Bottom [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Public Utilities, Inventory |  | 41 |  |
Nuclear Production, Net of Accumulated Depreciation |  | 777 |  |
Nuclear Fuel, Net of Accumulated Depreciation |  | 148 |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress |  | 20 |  |
Total Assets |  | 986 |  |
Asset Retirement Obligations, Noncurrent |  | 215 |  |
Liabilities |  | 215 |  |
Net Assets |  | $ 771 |  |
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 |  | $ 65 |  |
Nuclear Production, Net of Accumulated Depreciation |  | 626 |  |
Nuclear Fuel, Net of Accumulated Depreciation |  | 110 |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress |  | 132 |  |
Total Assets |  | 933 |  |
Asset Retirement Obligations, Noncurrent |  | 240 |  |
Liabilities |  | 240 |  |
Net Assets |  | $ 693 |  |
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 |  | $ 84 |  |
Nuclear Production, Net of Accumulated Depreciation |  | 635 |  |
Nuclear Fuel, Net of Accumulated Depreciation |  | 139 |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress |  | 131 |  |
Total Assets |  | 989 |  |
Asset Retirement Obligations, Noncurrent |  | 253 |  |
Liabilities |  | 253 |  |
Net Assets |  | $ 736 |  |
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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