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Accumulated Other Comprehensive Income (Details 1) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Other operating expenses $ (957) $ (964) $ (2,099) $ (1,882)
Interest expense (290) (289) (577) (577)
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) 291 (1,219) 622 (678)
Income taxes (benefits) (117) 130 (243) (83)
Prior-service costs 23 28 54 57
Gains & losses on cash flow hedges        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Prior-service costs (1) (2) (4) (4)
Unrealized gains on AFS securities        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Prior-service costs 6 12 22 25
Reclassifications from AOCI | Gains & losses on cash flow hedges        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Income taxes (benefits) (1) (1) (2) (2)
Net of tax 0 1 2 2
Reclassifications from AOCI | Gains & losses on cash flow hedges | Long-term debt        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Interest expense 1 2 4 4
Reclassifications from AOCI | Unrealized gains on AFS securities        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Investment income (loss) (6) (12) (22) (25)
Income taxes (benefits) 2 4 8 9
Net of tax (4) (8) (14) (16)
Reclassifications from AOCI | Net prior service costs        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Prior-service costs (18) (18) (36) (36)
Income taxes 8 7 14 14
Net of tax (10) (11) (22) (22)
FES        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Other operating expenses (286) (369) (804) (609)
INCOME (LOSS) BEFORE INCOME TAXES (BENEFITS) 42 (581) (79) (368)
Income taxes (benefits) (23) 143 18 61
Prior-service costs 10 15 28 32
FES | Gains & losses on cash flow hedges        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Prior-service costs 0 1 0 1
FES | Unrealized gains on AFS securities        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Prior-service costs 6 11 21 24
FES | Reclassifications from AOCI | Gains & losses on cash flow hedges        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Income taxes (benefits) 0 0 0 0
Net of tax 0 (1) 0 (1)
FES | Reclassifications from AOCI | Gains & losses on cash flow hedges | Commodity contracts        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Other operating expenses 0 (1) 0 (1)
FES | Reclassifications from AOCI | Unrealized gains on AFS securities        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Investment income (loss) (6) (11) (21) (24)
Income taxes (benefits) 2 4 8 9
Net of tax (4) (7) (13) (15)
FES | Reclassifications from AOCI | Net prior service costs        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Prior-service costs (4) (3) (7) (7)
Income taxes 2 1 3 3
Net of tax $ (2) $ (2) $ (4) $ (4)