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Supplemental Guarantor Information (Details 1) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
CURRENT ASSETS:        
Cash and cash equivalents $ 589 $ 199 $ 131 $ 85
Receivables-        
Customers 1,463 1,440    
Other Receivables 191 175    
Materials and supplies, at average cost 463 564    
Derivatives 37 140    
Collateral 146 176    
Total current assets 3,108 2,950    
PROPERTY, PLANT AND EQUIPMENT:        
In service 39,778 43,767    
Less — Accumulated provision for depreciation 11,925 15,731    
Property, plant and equipment in service net of accumulated provision for depreciation 27,853 28,036    
Construction work in progress 1,026 1,351    
Total net property, plant and equipment 28,879 29,387    
INVESTMENTS:        
Nuclear plant decommissioning trusts 2,678 2,514    
Other 506 512    
Total other property and investments 3,184 3,026    
DEFERRED CHARGES AND OTHER ASSETS:        
Goodwill 5,618 5,618 6,418  
Other 1,053 1,153    
Total deferred charges and other assets 6,711 7,785    
Total assets 42,257 43,148 52,094  
CURRENT LIABILITIES:        
Currently payable long-term debt 1,082 1,685    
Accounts payable-        
Accrued taxes 571 580    
Other 722 738    
Total current liabilities 4,077 7,126    
CAPITALIZATION:        
Long-term debt and other long-term obligations 21,115 18,192    
Total capitalization 25,040 24,433    
NONCURRENT LIABILITIES:        
Deferred gain on sale and leaseback transaction 723 757    
Accumulated deferred income taxes 1,359 3,765    
Retirement benefits 3,975 3,719    
Asset retirement obligations 2,515 1,482    
Other 1,718 1,547    
Total noncurrent liabilities 13,140 11,589    
Total liabilities and capitalization 42,257 43,148    
Eliminations        
CURRENT ASSETS:        
Cash and cash equivalents 0 0 0 0
Receivables-        
Customers 0 0    
Affiliated companies (326) (612)    
Other Receivables 0 0    
Notes receivable from affiliated companies (3,622) (3,351)    
Materials and supplies, at average cost 0 0    
Derivatives 0 0    
Collateral 0 0    
Prepaid taxes and other 0 0    
Total current assets (3,948) (3,963)    
PROPERTY, PLANT AND EQUIPMENT:        
In service (281) (290)    
Less — Accumulated provision for depreciation (189) (187)    
Property, plant and equipment in service net of accumulated provision for depreciation (92) (103)    
Construction work in progress 0 0    
Total net property, plant and equipment (92) (103)    
INVESTMENTS:        
Nuclear plant decommissioning trusts 0 0    
Investment in affiliated companies (1,153) (2,923)    
Other 0 0    
Total other property and investments (1,153) (2,923)    
DEFERRED CHARGES AND OTHER ASSETS:        
Accumulated deferred income tax benefits (193) (270)    
Property taxes 0 0    
Derivatives   0    
Other 25 21    
Total deferred charges and other assets (168) (249)    
Total assets (5,361) (7,238)    
CURRENT LIABILITIES:        
Currently payable long-term debt (28) (26)    
Accounts payable-        
Affiliated companies (319) (706)    
Other 0 0    
Accrued taxes (13) (16)    
Derivatives 0 0    
Other 41 36    
Total current liabilities (3,941) (4,063)    
CAPITALIZATION:        
Total equity (1,075) (2,834)    
Long-term debt and other long-term obligations (1,065) (1,091)    
Total capitalization (2,140) (3,925)    
NONCURRENT LIABILITIES:        
Deferred gain on sale and leaseback transaction 723 757    
Retirement benefits 0 0    
Asset retirement obligations 0 0    
Other (3) (7)    
Total noncurrent liabilities 720 750    
Total liabilities and capitalization (5,361) (7,238)    
Eliminations | Affiliates        
CURRENT LIABILITIES:        
Other Short-term Borrowings (3,622) (3,351)    
FES        
CURRENT ASSETS:        
Cash and cash equivalents 0 0 0 0
Receivables-        
Customers 181 213    
Affiliated companies 210 332    
Other Receivables 13 17    
Notes receivable from affiliated companies 366 501    
Materials and supplies, at average cost 41 45    
Derivatives 34 137    
Collateral 105 157    
Prepaid taxes and other 10 38    
Total current assets 960 1,440    
PROPERTY, PLANT AND EQUIPMENT:        
In service 122 120    
Less — Accumulated provision for depreciation 65 52    
Property, plant and equipment in service net of accumulated provision for depreciation 57 68    
Construction work in progress 3 2    
Total net property, plant and equipment 60 70    
INVESTMENTS:        
Nuclear plant decommissioning trusts 0 0    
Investment in affiliated companies 1,153 2,923    
Other 0 0    
Total other property and investments 1,153 2,923    
DEFERRED CHARGES AND OTHER ASSETS:        
Accumulated deferred income tax benefits 267 395    
Property taxes 0 0    
Derivatives   77    
Other 45 33    
Total deferred charges and other assets 312 505    
Total assets 2,485 4,938    
CURRENT LIABILITIES:        
Currently payable long-term debt 0 0    
Accounts payable-        
Affiliated companies 320 743    
Other 22 17    
Accrued taxes 52 50    
Derivatives 22 71    
Other 44 56    
Total current liabilities 3,785 3,906    
CAPITALIZATION:        
Total equity (2,070) 218    
Long-term debt and other long-term obligations 691 691    
Total capitalization (1,379) 909    
NONCURRENT LIABILITIES:        
Deferred gain on sale and leaseback transaction 0 0    
Retirement benefits 28 25    
Asset retirement obligations 0 0    
Other 51 98    
Total noncurrent liabilities 79 123    
Total liabilities and capitalization 2,485 4,938    
FES | Affiliates        
CURRENT LIABILITIES:        
Other Short-term Borrowings 3,325 2,969    
FG        
CURRENT ASSETS:        
Cash and cash equivalents 1 2 2 2
Receivables-        
Customers 0 0    
Affiliated companies 80 315    
Other Receivables 8 2    
Notes receivable from affiliated companies 1,744 1,585    
Materials and supplies, at average cost 142 142    
Derivatives 0 0    
Collateral 25 0    
Prepaid taxes and other 12 24    
Total current assets 2,012 2,070    
PROPERTY, PLANT AND EQUIPMENT:        
In service 2,646 2,524    
Less — Accumulated provision for depreciation 1,947 1,920    
Property, plant and equipment in service net of accumulated provision for depreciation 699 604    
Construction work in progress 19 67    
Total net property, plant and equipment 718 671    
INVESTMENTS:        
Nuclear plant decommissioning trusts 0 0    
Investment in affiliated companies 0 0    
Other 9 9    
Total other property and investments 9 9    
DEFERRED CHARGES AND OTHER ASSETS:        
Accumulated deferred income tax benefits 790 1,271    
Property taxes 9 12    
Derivatives   0    
Other 310 327    
Total deferred charges and other assets 1,109 1,610    
Total assets 3,848 4,360    
CURRENT LIABILITIES:        
Currently payable long-term debt 438 200    
Accounts payable-        
Affiliated companies 60 107    
Other 83 93    
Accrued taxes 12 48    
Derivatives 2 6    
Other 73 54    
Total current liabilities 1,070 991    
CAPITALIZATION:        
Total equity 547 828    
Long-term debt and other long-term obligations 1,666 2,093    
Total capitalization 2,213 2,921    
NONCURRENT LIABILITIES:        
Deferred gain on sale and leaseback transaction 0 0    
Retirement benefits 125 172    
Asset retirement obligations 187 188    
Other 253 88    
Total noncurrent liabilities 565 448    
Total liabilities and capitalization 3,848 4,360    
FG | Affiliates        
CURRENT LIABILITIES:        
Other Short-term Borrowings 402 483    
NG        
CURRENT ASSETS:        
Cash and cash equivalents 0 0 0 0
Receivables-        
Customers 0 0    
Affiliated companies 260 417    
Other Receivables 0 8    
Notes receivable from affiliated companies 1,512 1,294    
Materials and supplies, at average cost 0 80    
Derivatives 0 0    
Collateral 0 0    
Prepaid taxes and other 0 1    
Total current assets 1,772 1,800    
PROPERTY, PLANT AND EQUIPMENT:        
In service 8 4,703    
Less — Accumulated provision for depreciation 0 4,144    
Property, plant and equipment in service net of accumulated provision for depreciation 8 559    
Construction work in progress 0 358    
Total net property, plant and equipment 8 917    
INVESTMENTS:        
Nuclear plant decommissioning trusts 1,856 1,552    
Investment in affiliated companies 0 0    
Other 0 1    
Total other property and investments 1,856 1,553    
DEFERRED CHARGES AND OTHER ASSETS:        
Accumulated deferred income tax benefits 890 883    
Property taxes 16 28    
Derivatives   0    
Other 0 0    
Total deferred charges and other assets 906 911    
Total assets 4,542 5,181    
CURRENT LIABILITIES:        
Currently payable long-term debt 114 5    
Accounts payable-        
Affiliated companies 194 406    
Other 0 0    
Accrued taxes 21 61    
Derivatives 0 0    
Other 11 10    
Total current liabilities 340 482    
CAPITALIZATION:        
Total equity 528 2,006    
Long-term debt and other long-term obligations 1,007 1,120    
Total capitalization 1,535 3,126    
NONCURRENT LIABILITIES:        
Deferred gain on sale and leaseback transaction 0 0    
Retirement benefits 0 0    
Asset retirement obligations 1,758 713    
Other 909 860    
Total noncurrent liabilities 2,667 1,573    
Total liabilities and capitalization 4,542 5,181    
NG | Affiliates        
CURRENT LIABILITIES:        
Other Short-term Borrowings 0 0    
Consolidated        
CURRENT ASSETS:        
Cash and cash equivalents 1 2 $ 2 $ 2
Receivables-        
Customers 181 213    
Affiliated companies 224 452    
Other Receivables 21 27    
Notes receivable from affiliated companies 0 29    
Materials and supplies, at average cost 183 267    
Derivatives 34 137    
Collateral 130 157    
Prepaid taxes and other 22 63    
Total current assets 796 1,347    
PROPERTY, PLANT AND EQUIPMENT:        
In service 2,495 7,057    
Less — Accumulated provision for depreciation 1,823 5,929    
Property, plant and equipment in service net of accumulated provision for depreciation 672 1,128    
Construction work in progress 22 427    
Total net property, plant and equipment 694 1,555    
INVESTMENTS:        
Nuclear plant decommissioning trusts 1,856 1,552    
Investment in affiliated companies 0 0    
Other 9 10    
Total other property and investments 1,865 1,562    
DEFERRED CHARGES AND OTHER ASSETS:        
Accumulated deferred income tax benefits 1,754 2,279    
Property taxes 25 40    
Derivatives 0 77    
Other 380 381    
Total deferred charges and other assets 2,159 2,777    
Total assets 5,514 7,241    
CURRENT LIABILITIES:        
Currently payable long-term debt 524 179    
Accounts payable-        
Affiliated companies 255 550    
Other 105 110    
Accrued taxes 72 143    
Derivatives 24 77    
Other 169 156    
Total current liabilities 1,254 1,316    
CAPITALIZATION:        
Total equity (2,070) 218    
Long-term debt and other long-term obligations 2,299 2,813    
Total capitalization 229 3,031    
NONCURRENT LIABILITIES:        
Deferred gain on sale and leaseback transaction 723 757    
Retirement benefits 153 197    
Asset retirement obligations 1,945 901    
Other 1,210 1,039    
Total noncurrent liabilities 4,031 2,894    
Total liabilities and capitalization 5,514 7,241    
Consolidated | Affiliates        
CURRENT LIABILITIES:        
Other Short-term Borrowings $ 105 $ 101