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Supplemental Guarantor Information (Details 1) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
CURRENT ASSETS:        
Cash and cash equivalents $ 164 $ 199 $ 146 $ 131
Receivables-        
Customers 1,396 1,440    
Other 155 175    
Materials and supplies 531 564    
Derivatives 43 140    
Collateral 122 176    
Prepaid taxes and other 147 158    
Total current assets 2,760 2,950    
PROPERTY, PLANT AND EQUIPMENT:        
In service 42,976 43,767    
Less — Accumulated provision for depreciation 15,769 15,731    
Property, plant and equipment in service net of accumulated provision for depreciation 27,207 28,036    
Construction work in progress 1,588 1,351    
Total net property, plant and equipment 28,795 29,387    
INVESTMENTS:        
Nuclear plant decommissioning trusts 2,571 2,514    
Other 519 512    
Total other property and investments 3,090 3,026    
DEFERRED CHARGES AND OTHER ASSETS:        
Other 1,028 1,153    
Total deferred charges and other assets 7,646 7,785    
Total assets 43,212 43,148 52,695  
CURRENT LIABILITIES:        
Currently payable long-term debt 2,147 1,685    
Accounts payable-        
Accrued taxes 555 580    
Derivatives 27 78    
Other 848 660    
Total current liabilities 7,657 7,126    
CAPITALIZATION:        
Total equity 6,139 6,241    
Long-term debt and other long-term obligations 17,762 18,192    
Total capitalization 23,901 24,433    
NONCURRENT LIABILITIES:        
Deferred gain on sale and leaseback transaction 748 757    
Accumulated deferred income taxes 3,882 3,765    
Retirement benefits 3,756 3,719    
Asset retirement obligations 1,505 1,482    
Other 1,606 1,704    
Total noncurrent liabilities 11,654 11,589    
Total liabilities and capitalization 43,212 43,148    
Eliminations        
CURRENT ASSETS:        
Cash and cash equivalents 0 0 0 0
Receivables-        
Customers 0 0    
Affiliated companies (315) (612)    
Other 0 0    
Notes receivable from affiliated companies (3,417) (3,351)    
Materials and supplies 0 0    
Derivatives 0 0    
Collateral 0 0    
Prepaid taxes and other 0 0    
Total current assets (3,732) (3,963)    
PROPERTY, PLANT AND EQUIPMENT:        
In service (281) (290)    
Less — Accumulated provision for depreciation (187) (187)    
Property, plant and equipment in service net of accumulated provision for depreciation (94) (103)    
Construction work in progress 0 0    
Total net property, plant and equipment (94) (103)    
INVESTMENTS:        
Nuclear plant decommissioning trusts 0 0    
Investment in affiliated companies (2,911) (2,923)    
Other 0 0    
Total other property and investments (2,911) (2,923)    
DEFERRED CHARGES AND OTHER ASSETS:        
Property taxes 0 0    
Accumulated deferred income tax benefits (272) (270)    
Derivatives 0 0    
Other 25 21    
Total deferred charges and other assets (247) (249)    
Total assets (6,984) (7,238)    
CURRENT LIABILITIES:        
Currently payable long-term debt (26) (26)    
Accounts payable-        
Affiliated companies (409) (706)    
Other 0 0    
Accrued taxes (16) (16)    
Derivatives 0 0    
Other 46 36    
Total current liabilities (3,822) (4,063)    
CAPITALIZATION:        
Total equity (2,814) (2,834)    
Long-term debt and other long-term obligations (1,092) (1,091)    
Total capitalization (3,906) (3,925)    
NONCURRENT LIABILITIES:        
Deferred gain on sale and leaseback transaction 748 757    
Accumulated deferred income taxes (4) (7)    
Retirement benefits 0 0    
Asset retirement obligations 0 0    
Derivatives 0 0    
Other 0 0    
Total noncurrent liabilities 744 750    
Total liabilities and capitalization (6,984) (7,238)    
Eliminations | Affiliates        
CURRENT LIABILITIES:        
Short-term borrowings - affiliated companies (3,417) (3,351)    
FES        
CURRENT ASSETS:        
Cash and cash equivalents 0 0 0 0
Receivables-        
Customers 173 213    
Affiliated companies 266 332    
Other 14 17    
Notes receivable from affiliated companies 457 501    
Materials and supplies 34 45    
Derivatives 43 137    
Collateral 106 157    
Prepaid taxes and other 44 38    
Total current assets 1,137 1,440    
PROPERTY, PLANT AND EQUIPMENT:        
In service 121 120    
Less — Accumulated provision for depreciation 56 52    
Property, plant and equipment in service net of accumulated provision for depreciation 65 68    
Construction work in progress 3 2    
Total net property, plant and equipment 68 70    
INVESTMENTS:        
Nuclear plant decommissioning trusts 0 0    
Investment in affiliated companies 2,911 2,923    
Other 0 0    
Total other property and investments 2,911 2,923    
DEFERRED CHARGES AND OTHER ASSETS:        
Property taxes 0 0    
Accumulated deferred income tax benefits 392 395    
Derivatives 17 77    
Other 33 33    
Total deferred charges and other assets 442 505    
Total assets 4,558 4,938    
CURRENT LIABILITIES:        
Currently payable long-term debt 0 0    
Accounts payable-        
Affiliated companies 446 743    
Other 26 17    
Accrued taxes 50 50    
Derivatives 21 71    
Other 32 56    
Total current liabilities 3,644 3,906    
CAPITALIZATION:        
Total equity 146 218    
Long-term debt and other long-term obligations 691 691    
Total capitalization 837 909    
NONCURRENT LIABILITIES:        
Deferred gain on sale and leaseback transaction 0 0    
Accumulated deferred income taxes 4 4    
Retirement benefits 27 25    
Asset retirement obligations 0 0    
Derivatives 3 52    
Other 43 42    
Total noncurrent liabilities 77 123    
Total liabilities and capitalization 4,558 4,938    
FES | Affiliates        
CURRENT LIABILITIES:        
Short-term borrowings - affiliated companies 3,069 2,969    
FG        
CURRENT ASSETS:        
Cash and cash equivalents 2 2 2 2
Receivables-        
Customers 0 0    
Affiliated companies 188 315    
Other 3 2    
Notes receivable from affiliated companies 1,675 1,585    
Materials and supplies 135 142    
Derivatives 0 0    
Collateral 1 0    
Prepaid taxes and other 6 24    
Total current assets 2,010 2,070    
PROPERTY, PLANT AND EQUIPMENT:        
In service 2,550 2,524    
Less — Accumulated provision for depreciation 1,931 1,920    
Property, plant and equipment in service net of accumulated provision for depreciation 619 604    
Construction work in progress 58 67    
Total net property, plant and equipment 677 671    
INVESTMENTS:        
Nuclear plant decommissioning trusts 0 0    
Investment in affiliated companies 0 0    
Other 10 9    
Total other property and investments 10 9    
DEFERRED CHARGES AND OTHER ASSETS:        
Property taxes 9 12    
Accumulated deferred income tax benefits 1,305 1,271    
Derivatives 0 0    
Other 335 327    
Total deferred charges and other assets 1,649 1,610    
Total assets 4,346 4,360    
CURRENT LIABILITIES:        
Currently payable long-term debt 171 200    
Accounts payable-        
Affiliated companies 81 107    
Other 81 93    
Accrued taxes 42 48    
Derivatives 4 6    
Other 101 54    
Total current liabilities 941 991    
CAPITALIZATION:        
Total equity 741 828    
Long-term debt and other long-term obligations 2,093 2,093    
Total capitalization 2,834 2,921    
NONCURRENT LIABILITIES:        
Deferred gain on sale and leaseback transaction 0 0    
Accumulated deferred income taxes 0 3    
Retirement benefits 175 172    
Asset retirement obligations 189 188    
Derivatives 0 0    
Other 207 85    
Total noncurrent liabilities 571 448    
Total liabilities and capitalization 4,346 4,360    
FG | Affiliates        
CURRENT LIABILITIES:        
Short-term borrowings - affiliated companies 461 483    
NG        
CURRENT ASSETS:        
Cash and cash equivalents 0 0 0 0
Receivables-        
Customers 0 0    
Affiliated companies 237 417    
Other 34 8    
Notes receivable from affiliated companies 1,285 1,294    
Materials and supplies 83 80    
Derivatives 0 0    
Collateral 0 0    
Prepaid taxes and other 1 1    
Total current assets 1,640 1,800    
PROPERTY, PLANT AND EQUIPMENT:        
In service 4,718 4,703    
Less — Accumulated provision for depreciation 4,198 4,144    
Property, plant and equipment in service net of accumulated provision for depreciation 520 559    
Construction work in progress 427 358    
Total net property, plant and equipment 947 917    
INVESTMENTS:        
Nuclear plant decommissioning trusts 1,593 1,552    
Investment in affiliated companies 0 0    
Other 0 1    
Total other property and investments 1,593 1,553    
DEFERRED CHARGES AND OTHER ASSETS:        
Property taxes 21 28    
Accumulated deferred income tax benefits 843 883    
Derivatives 0 0    
Other 0 0    
Total deferred charges and other assets 864 911    
Total assets 5,044 5,181    
CURRENT LIABILITIES:        
Currently payable long-term debt 5 5    
Accounts payable-        
Affiliated companies 198 406    
Other 0 0    
Accrued taxes 61 61    
Derivatives 0 0    
Other 15 10    
Total current liabilities 280 482    
CAPITALIZATION:        
Total equity 2,073 2,006    
Long-term debt and other long-term obligations 1,120 1,120    
Total capitalization 3,193 3,126    
NONCURRENT LIABILITIES:        
Deferred gain on sale and leaseback transaction 0 0    
Accumulated deferred income taxes 0 0    
Retirement benefits 0 0    
Asset retirement obligations 726 713    
Derivatives 0 0    
Other 845 860    
Total noncurrent liabilities 1,571 1,573    
Total liabilities and capitalization 5,044 5,181    
NG | Affiliates        
CURRENT LIABILITIES:        
Short-term borrowings - affiliated companies 1 0    
Consolidated        
CURRENT ASSETS:        
Cash and cash equivalents 2 2 $ 2 $ 2
Receivables-        
Customers 173 213    
Affiliated companies 376 452    
Other 51 27    
Notes receivable from affiliated companies 0 29    
Materials and supplies 252 267    
Derivatives 43 137    
Collateral 107 157    
Prepaid taxes and other 51 63    
Total current assets 1,055 1,347    
PROPERTY, PLANT AND EQUIPMENT:        
In service 7,108 7,057    
Less — Accumulated provision for depreciation 5,998 5,929    
Property, plant and equipment in service net of accumulated provision for depreciation 1,110 1,128    
Construction work in progress 488 427    
Total net property, plant and equipment 1,598 1,555    
INVESTMENTS:        
Nuclear plant decommissioning trusts 1,593 1,552    
Investment in affiliated companies 0 0    
Other 10 10    
Total other property and investments 1,603 1,562    
DEFERRED CHARGES AND OTHER ASSETS:        
Property taxes 30 40    
Accumulated deferred income tax benefits 2,268 2,279    
Derivatives 17 77    
Other 393 381    
Total deferred charges and other assets 2,708 2,777    
Total assets 6,964 7,241    
CURRENT LIABILITIES:        
Currently payable long-term debt 150 179    
Accounts payable-        
Affiliated companies 316 550    
Other 107 110    
Accrued taxes 137 143    
Derivatives 25 77    
Other 194 156    
Total current liabilities 1,043 1,316    
CAPITALIZATION:        
Total equity 146 218    
Long-term debt and other long-term obligations 2,812 2,813    
Total capitalization 2,958 3,031    
NONCURRENT LIABILITIES:        
Deferred gain on sale and leaseback transaction 748 757    
Accumulated deferred income taxes 0 0    
Retirement benefits 202 197    
Asset retirement obligations 915 901    
Derivatives 3 52    
Other 1,095 987    
Total noncurrent liabilities 2,963 2,894    
Total liabilities and capitalization 6,964 7,241    
Consolidated | Affiliates        
CURRENT LIABILITIES:        
Short-term borrowings - affiliated companies $ 114 $ 101