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Accumulated Other Comprehensive Income (Details 1) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Other operating expenses $ 942 $ 953 $ 3,041 $ 2,835
Interest expense 305 286 882 863
Income taxes (benefits) 239 251 482 334
Prior-service costs 48 33 102 90
Gains & losses on cash flow hedges        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Prior-service costs (4) (2) (8) (6)
Unrealized gains on AFS securities        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Prior-service costs 33 17 55 42
Reclassifications from AOCI | Gains & losses on cash flow hedges        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Income taxes (benefits) (1) 0 (3) (2)
Net of tax 3 2 5 4
Reclassifications from AOCI | Gains & losses on cash flow hedges | Long-term debt        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Interest expense 4 2 8 6
Reclassifications from AOCI | Unrealized gains on AFS securities        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Investment income (loss) (33) (17) (55) (42)
Income taxes (benefits) 12 7 20 16
Net of tax (21) (10) (35) (26)
Reclassifications from AOCI | Net prior service costs        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Prior-service costs (19) (18) (55) (54)
Income taxes 7 7 21 21
Net of tax (12) (11) (34) (33)
FES        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Other operating expenses 291 316 1,095 925
Income taxes (benefits) 32 56 14 (5)
Prior-service costs 35 19 63 51
FES | Gains & losses on cash flow hedges        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Prior-service costs (1) (1) (1) 0
FES | Unrealized gains on AFS securities        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Prior-service costs 33 17 54 41
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 1 1 1 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 1 1 1 0
FES | Reclassifications from AOCI | Unrealized gains on AFS securities        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Investment income (loss) (33) (17) (54) (41)
Income taxes (benefits) 11 6 19 15
Net of tax (22) (11) (35) (26)
FES | Reclassifications from AOCI | Net prior service costs        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Prior-service costs (3) (3) (10) (10)
Income taxes 1 1 4 4
Net of tax $ (2) $ (2) $ (6) $ (6)