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Commitments And Contingent Liabilities (Nuclear Insurance Coverages and Assessments) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($)
Other Commitments [Line Items] |
Maximum Aggregate Assessment Per Incident | $ 433
Maximum Aggregate Annual Assessment | 65
Nuclear Insurance Aggregate Limit | 3,200
Total Site Coverage for Nuclear Event [Member] |
Other Commitments [Line Items] |
Nuclear Liability Total | 13,500
Total Site Coverage for Nuclear Event [Member] | American Nuclear Insurers [Member] |
Other Commitments [Line Items] |
Public And Nuclear Worker Liability Primary Layer | 450
Retrospective Assessments [Member] |
Other Commitments [Line Items] |
Replacement Power Total | $ 61

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