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Commitments and Contingencies (Environmental Matters and Other) (Details) - USD ($)
Apr. 01, 2016
Mar. 31, 2016
Other - Nuclear Insurance (Numeric) [Abstract]    
Maximum public liability for claims resulting an incident at nuclear station   $ 13,400,000,000
Maximum amount that could be assessed resulting from an incident at nuclear station   255,000,000
Maximum amount payable per year resulting from an incident at nuclear station   38,000,000
Maximum amount of insured property damage losses at nuclear station   2,000,000,000
Maximum assessment for retroactive premiums for nuclear outage insurance coverage   $ 55,000,000
Subsequent Event    
Other - Nuclear Insurance (Numeric) [Abstract]    
Maximum assessment for retroactive premiums for nuclear outage insurance coverage $ 61,000,000