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Accumulated Other Comprehensive Income (Details 1) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Other operating expenses $ (953) $ (842) $ (2,835) $ (2,799)
Interest expense (286) (285) (863) (846)
INCOME (LOSS) BEFORE INCOME TAXES 631 621 (47) 1,289
Income taxes (251) (226) (334) (485)
FES        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Other operating expenses (316) (246) (925) (996)
INCOME (LOSS) BEFORE INCOME TAXES 96 190 (272) 160
Income taxes (56) (70) 5 (64)
Reclassifications from AOCI | Gains & losses on cash flow hedges        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
INCOME (LOSS) BEFORE INCOME TAXES 2 2 6 4
Income taxes 0 (1) (2) (2)
Net of tax 2 1 4 2
Reclassifications from AOCI | Gains & losses on cash flow hedges | FES        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Income taxes 0 0 0 0
Net of tax 1 0 0 (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 0 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 0 0 (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 6 6
Reclassifications from AOCI | Unrealized gains on AFS securities        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Investment income (loss) (17) (3) (42) (20)
Income taxes 7 1 16 7
Net of tax (10) (2) (26) (13)
Reclassifications from AOCI | Unrealized gains on AFS securities | FES        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Investment income (loss) (17) (3) (41) (18)
Income taxes 6 1 15 7
Net of tax (11) (2) (26) (11)
Reclassifications from AOCI | Defined benefit pension and OPEB plans        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Prior-service costs (18) (31) (54) (94)
Income taxes 7 12 21 36
Net of tax (11) (19) (33) (58)
Reclassifications from AOCI | Defined benefit pension and OPEB plans | FES        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Prior-service costs (3) (4) (10) (12)
Income taxes 1 1 4 4
Net of tax $ (2) $ (3) $ (6) $ (8)