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Taxes (Details 3)
$ in Millions
Dec. 31, 2017
USD ($)
State  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes $ 7,047
State | 2018-2022  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 806
State | 2023-2027  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 1,963
State | 2028-2032  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 2,382
State | 2033-2037  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 1,896
Local  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 3,472
Local | 2018-2022  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 3,472
Local | 2023-2027  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 0
Local | 2028-2032  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 0
Local | 2033-2037  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 0
FES | State  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 1,719
FES | State | 2018-2022  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 2
FES | State | 2023-2027  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 32
FES | State | 2028-2032  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 703
FES | State | 2033-2037  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 982
FES | Local  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 1,954
FES | Local | 2018-2022  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 1,954
FES | Local | 2023-2027  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 0
FES | Local | 2028-2032  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 0
FES | Local | 2033-2037  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes $ 0