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Accumulated Other Comprehensive Income (Details 1) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Other operating expenses $ 964 $ 900 $ 1,882 $ 1,957
Interest expense 289 282 577 561
Investment income (loss) (19) 3 (47) (14)
Total before taxes 1,219 (302) 678 (668)
Income taxes (benefits) (130) 115 83 259
Net of tax 1,089 (187) 761 (409)
FES        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Other operating expenses 369 337 609 750
Investment income (loss) (19) (1) (32) (14)
Total before taxes 581 25 368 30
Income taxes (benefits) (143) (4) (61) (6)
Reclassifications from AOCI | Gains & losses on cash flow hedges        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Total before taxes 2 1 4 2
Income taxes (benefits) (1) (1) (2) (1)
Net of tax 1 0 2 1
Reclassifications from AOCI | Gains & losses on cash flow hedges | FES        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Income taxes (benefits) 0 0 0 0
Net of tax (1) (1) (1) (2)
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 (2)
Reclassifications from AOCI | Gains & losses on cash flow hedges | Commodity contracts | FES        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Other operating expenses (1) (1) (1) (2)
Reclassifications from AOCI | Gains & losses on cash flow hedges | Long-term debt        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Interest expense 2 2 4 4
Reclassifications from AOCI | Unrealized gains on AFS securities        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Investment income (loss) (12) (7) (25) (17)
Income taxes (benefits) 4 2 9 6
Net of tax (8) (5) (16) (11)
Reclassifications from AOCI | Unrealized gains on AFS securities | FES        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Investment income (loss) (11) (5) (24) (15)
Income taxes (benefits) 4 2 9 6
Net of tax (7) (3) (15) (9)
Reclassifications from AOCI | Defined benefit pension and OPEB plans        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Prior-service costs (18) (32) (36) (63)
Income taxes (benefits) 7 13 14 24
Net of tax (11) (19) (22) (39)
Reclassifications from AOCI | Defined benefit pension and OPEB plans | FES        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Prior-service costs (3) (4) (7) (8)
Income taxes (benefits) 1 2 3 3
Net of tax $ (2) $ (2) $ (4) $ (5)