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Accumulated Other Comprehensive Income (Details 1) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Other operating expenses $ (1,142) $ (918)
Interest expense (287) (288)
INCOME BEFORE INCOME TAXES 331 541
Income taxes (benefits) (126) (213)
Prior-service costs 31 29
Gains & losses on cash flow hedges    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Prior-service costs (3) (2)
Unrealized gains on AFS securities    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Prior-service costs 16 13
Defined Benefit Pension & OPEB Plans    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Prior-service costs 18 18
Reclassifications from AOCI | Gains & losses on cash flow hedges    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
INCOME BEFORE INCOME TAXES 3 2
Income taxes (benefits) (1) (1)
Net of tax 2 1
Reclassifications from AOCI | Gains & losses on cash flow hedges | Commodity contracts    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Other operating expenses 0 0
Reclassifications from AOCI | Gains & losses on cash flow hedges | Long-term debt    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Interest expense 3 2
Reclassifications from AOCI | Unrealized gains on AFS securities    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Investment income (loss) (16) (13)
Income taxes (benefits) 6 5
Net of tax (10) (8)
Reclassifications from AOCI | Net prior service costs    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Prior-service costs (18) (18)
Income taxes 6 7
Net of tax (12) (11)
FES    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Other operating expenses (518) (240)
INCOME BEFORE INCOME TAXES (121) 213
Income taxes (benefits) 41 (82)
Prior-service costs 18 17
FES | Gains & losses on cash flow hedges    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Prior-service costs 0 0
FES | Unrealized gains on AFS securities    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Prior-service costs 15 13
FES | Defined Benefit Pension & OPEB Plans    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Prior-service costs 3 4
FES | Reclassifications from AOCI | Gains & losses on cash flow hedges    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Income taxes (benefits) 0 0
Net of tax 0 0
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 0
FES | Reclassifications from AOCI | Unrealized gains on AFS securities    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Investment income (loss) (15) (13)
Income taxes (benefits) 6 5
Net of tax (9) (8)
FES | Reclassifications from AOCI | Net prior service costs    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Prior-service costs (3) (4)
FES | Reclassifications from AOCI | Defined Benefit Pension & OPEB Plans    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Income taxes 1 2
Net of tax $ (2) $ (2)