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Commitments, Guarantees and Contingencies - Other Legal Proceedings (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Nov. 12, 2019
Sep. 30, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]        
Nuclear plant decommissioning trusts $ 0     $ 790
Noncurrent liabilities - held for sale (Note 10) 691     0
Investments - held for sale (Note 10) 882     $ 0
Nuclear Plant Matters        
Loss Contingencies [Line Items]        
Nuclear plant decommissioning trusts 882      
TMI-2        
Loss Contingencies [Line Items]        
Noncurrent liabilities - held for sale (Note 10) $ 691      
Financial Guarantee | JCP&L, ME, PN and GPUN | Nuclear Plant Matters        
Loss Contingencies [Line Items]        
Nuclear plant decommissioning trusts     $ 900  
Ownership interest   25.00%