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Taxes (Details 3)
$ in Millions
Dec. 31, 2015
USD ($)
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes $ 10,000
State Jurisdiction  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 7,176
State Jurisdiction | 2016-2020  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 403
State Jurisdiction | 2021-2025  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 1,323
State Jurisdiction | 2023-2030  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 2,205
State Jurisdiction | 2031-2035  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 3,245
Local Jurisdiction  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 2,983
Local Jurisdiction | 2016-2020  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 2,983
Local Jurisdiction | 2021-2025  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 0
Local Jurisdiction | 2023-2030  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 0
Local Jurisdiction | 2031-2035  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 0
FES | State Jurisdiction  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 1,550
FES | State Jurisdiction | 2016-2020  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 95
FES | State Jurisdiction | 2021-2025  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 68
FES | State Jurisdiction | 2023-2030  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 259
FES | State Jurisdiction | 2031-2035  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 1,128
FES | Local Jurisdiction  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 1,820
FES | Local Jurisdiction | 2016-2020  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 1,820
FES | Local Jurisdiction | 2021-2025  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 0
FES | Local Jurisdiction | 2023-2030  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes 0
FES | Local Jurisdiction | 2031-2035  
Pre-tax net operating loss expiration period  
Pre-tax net operating loss carryforwards for state and local income tax purposes $ 0