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Supplemental Guarantor Information (Details 1) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | $ 114 | $ 199 | $ 199 | $ 131
Receivables- |  |  |  |
Customers | 1,375 | 1,440 |  |
Other | 161 | 175 |  |
Materials and supplies | 553 | 564 |  |
Derivatives | 45 | 140 |  |
Collateral | 129 | 176 |  |
Prepaid taxes and other | 151 | 158 |  |
Total current assets | 2,755 | 2,950 |  |
PROPERTY, PLANT AND EQUIPMENT: |  |  |  |
In service | 43,929 | 43,767 |  |
Less — Accumulated provision for depreciation | 15,999 | 15,731 |  |
Property, plant and equipment in service net of accumulated provision for depreciation | 27,930 | 28,036 |  |
Construction work in progress | 1,249 | 1,351 |  |
Total net property, plant and equipment | 29,179 | 29,387 |  |
INVESTMENTS: |  |  |  |
Nuclear plant decommissioning trusts | 2,588 | 2,514 |  |
Other | 507 | 512 |  |
Total other property and investments | 3,095 | 3,026 |  |
DEFERRED CHARGES AND OTHER ASSETS: |  |  |  |
Other | 871 | 1,153 |  |
Total deferred charges and other assets | 7,483 | 7,785 |  |
Total assets | 43,327 | 43,148 | 51,401 |
CURRENT LIABILITIES: |  |  |  |
Currently payable long-term debt | 2,015 | 1,685 |  |
Accounts payable- |  |  |  |
Accrued taxes | 518 | 580 |  |
Derivatives | 18 | 78 |  |
Other | 619 | 660 |  |
Total current liabilities | 4,647 | 7,126 |  |
CAPITALIZATION: |  |  |  |
Total equity | 6,320 | 6,241 |  |
Long-term debt and other long-term obligations | 20,582 | 18,192 |  |
Total capitalization | 26,902 | 24,433 |  |
NONCURRENT LIABILITIES: |  |  |  |
Deferred gain on sale and leaseback transaction | 740 | 757 |  |
Accumulated deferred income taxes | 3,992 | 3,765 |  |
Retirement benefits | 3,784 | 3,719 |  |
Asset retirement obligations | 1,526 | 1,482 |  |
Other | 1,584 | 1,704 |  |
Total noncurrent liabilities | 11,778 | 11,589 |  |
Total liabilities and capitalization | 43,327 | 43,148 |  |
Eliminations |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Receivables- |  |  |  |
Customers | 0 | 0 |  |
Affiliated companies | (392) | (612) |  |
Other | 0 | 0 |  |
Notes receivable from affiliated companies | (3,326) | (3,351) |  |
Materials and supplies | 0 | 0 |  |
Derivatives | 0 | 0 |  |
Collateral | 0 | 0 |  |
Prepaid taxes and other | 0 | 0 |  |
Total current assets | (3,718) | (3,963) |  |
PROPERTY, PLANT AND EQUIPMENT: |  |  |  |
In service | (281) | (290) |  |
Less — Accumulated provision for depreciation | (188) | (187) |  |
Property, plant and equipment in service net of accumulated provision for depreciation | (93) | (103) |  |
Construction work in progress | 0 | 0 |  |
Total net property, plant and equipment | (93) | (103) |  |
INVESTMENTS: |  |  |  |
Nuclear plant decommissioning trusts | 0 | 0 |  |
Investment in affiliated companies | (3,230) | (2,923) |  |
Other | 0 | 0 |  |
Total other property and investments | (3,230) | (2,923) |  |
DEFERRED CHARGES AND OTHER ASSETS: |  |  |  |
Property taxes | 0 | 0 |  |
Accumulated deferred income tax benefits | (273) | (270) |  |
Derivatives | 0 | 0 |  |
Other | 18 | 21 |  |
Total deferred charges and other assets | (255) | (249) |  |
Total assets | (7,296) | (7,238) |  |
CURRENT LIABILITIES: |  |  |  |
Currently payable long-term debt | (27) | (26) |  |
Accounts payable- |  |  |  |
Affiliated companies | (473) | (706) |  |
Other | 0 | 0 |  |
Accrued taxes | (29) | (16) |  |
Derivatives | 0 | 0 |  |
Other | 33 | 36 |  |
Total current liabilities | (3,822) | (4,063) |  |
CAPITALIZATION: |  |  |  |
Total equity | (3,131) | (2,834) |  |
Long-term debt and other long-term obligations | (1,078) | (1,091) |  |
Total capitalization | (4,209) | (3,925) |  |
NONCURRENT LIABILITIES: |  |  |  |
Deferred gain on sale and leaseback transaction | 740 | 757 |  |
Accumulated deferred income taxes | (5) | (7) |  |
Retirement benefits | 0 | 0 |  |
Asset retirement obligations | 0 | 0 |  |
Derivatives | 0 | 0 |  |
Other | 0 | 0 |  |
Total noncurrent liabilities | 735 | 750 |  |
Total liabilities and capitalization | (7,296) | (7,238) |  |
Eliminations | Affiliates |  |  |  |
CURRENT LIABILITIES: |  |  |  |
Short-term borrowings - affiliated companies | (3,326) | (3,351) |  |
FES |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Receivables- |  |  |  |
Customers | 185 | 213 |  |
Affiliated companies | 300 | 332 |  |
Other | 10 | 17 |  |
Notes receivable from affiliated companies | 361 | 501 |  |
Materials and supplies | 41 | 45 |  |
Derivatives | 41 | 137 |  |
Collateral | 98 | 157 |  |
Prepaid taxes and other | 40 | 38 |  |
Total current assets | 1,076 | 1,440 |  |
PROPERTY, PLANT AND EQUIPMENT: |  |  |  |
In service | 121 | 120 |  |
Less — Accumulated provision for depreciation | 59 | 52 |  |
Property, plant and equipment in service net of accumulated provision for depreciation | 62 | 68 |  |
Construction work in progress | 2 | 2 |  |
Total net property, plant and equipment | 64 | 70 |  |
INVESTMENTS: |  |  |  |
Nuclear plant decommissioning trusts | 0 | 0 |  |
Investment in affiliated companies | 3,230 | 2,923 |  |
Other | 0 | 0 |  |
Total other property and investments | 3,230 | 2,923 |  |
DEFERRED CHARGES AND OTHER ASSETS: |  |  |  |
Property taxes | 0 | 0 |  |
Accumulated deferred income tax benefits | 440 | 395 |  |
Derivatives | 9 | 77 |  |
Other | 32 | 33 |  |
Total deferred charges and other assets | 481 | 505 |  |
Total assets | 4,851 | 4,938 |  |
CURRENT LIABILITIES: |  |  |  |
Currently payable long-term debt | 0 | 0 |  |
Accounts payable- |  |  |  |
Affiliated companies | 477 | 743 |  |
Other | 17 | 17 |  |
Accrued taxes | 48 | 50 |  |
Derivatives | 15 | 71 |  |
Other | 47 | 56 |  |
Total current liabilities | 3,845 | 3,906 |  |
CAPITALIZATION: |  |  |  |
Total equity | 239 | 218 |  |
Long-term debt and other long-term obligations | 691 | 691 |  |
Total capitalization | 930 | 909 |  |
NONCURRENT LIABILITIES: |  |  |  |
Deferred gain on sale and leaseback transaction | 0 | 0 |  |
Accumulated deferred income taxes | 5 | 4 |  |
Retirement benefits | 27 | 25 |  |
Asset retirement obligations | 0 | 0 |  |
Derivatives | 1 | 52 |  |
Other | 43 | 42 |  |
Total noncurrent liabilities | 76 | 123 |  |
Total liabilities and capitalization | 4,851 | 4,938 |  |
FES | Affiliates |  |  |  |
CURRENT LIABILITIES: |  |  |  |
Short-term borrowings - affiliated companies | 3,241 | 2,969 |  |
FG |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 2 | 2 | 2 | 2
Receivables- |  |  |  |
Customers | 0 | 0 |  |
Affiliated companies | 240 | 315 |  |
Other | 2 | 2 |  |
Notes receivable from affiliated companies | 1,599 | 1,585 |  |
Materials and supplies | 137 | 142 |  |
Derivatives | 0 | 0 |  |
Collateral | 13 | 0 |  |
Prepaid taxes and other | 11 | 24 |  |
Total current assets | 2,004 | 2,070 |  |
PROPERTY, PLANT AND EQUIPMENT: |  |  |  |
In service | 2,561 | 2,524 |  |
Less — Accumulated provision for depreciation | 1,936 | 1,920 |  |
Property, plant and equipment in service net of accumulated provision for depreciation | 625 | 604 |  |
Construction work in progress | 55 | 67 |  |
Total net property, plant and equipment | 680 | 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: |  |  |  |
Property taxes | 6 | 12 |  |
Accumulated deferred income tax benefits | 1,203 | 1,271 |  |
Derivatives | 0 | 0 |  |
Other | 329 | 327 |  |
Total deferred charges and other assets | 1,538 | 1,610 |  |
Total assets | 4,231 | 4,360 |  |
CURRENT LIABILITIES: |  |  |  |
Currently payable long-term debt | 183 | 200 |  |
Accounts payable- |  |  |  |
Affiliated companies | 92 | 107 |  |
Other | 74 | 93 |  |
Accrued taxes | 51 | 48 |  |
Derivatives | 3 | 6 |  |
Other | 80 | 54 |  |
Total current liabilities | 843 | 991 |  |
CAPITALIZATION: |  |  |  |
Total equity | 914 | 828 |  |
Long-term debt and other long-term obligations | 1,938 | 2,093 |  |
Total capitalization | 2,852 | 2,921 |  |
NONCURRENT LIABILITIES: |  |  |  |
Deferred gain on sale and leaseback transaction | 0 | 0 |  |
Accumulated deferred income taxes | 0 | 3 |  |
Retirement benefits | 178 | 172 |  |
Asset retirement obligations | 188 | 188 |  |
Derivatives | 0 | 0 |  |
Other | 170 | 85 |  |
Total noncurrent liabilities | 536 | 448 |  |
Total liabilities and capitalization | 4,231 | 4,360 |  |
FG | Affiliates |  |  |  |
CURRENT LIABILITIES: |  |  |  |
Short-term borrowings - affiliated companies | 360 | 483 |  |
NG |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Receivables- |  |  |  |
Customers | 0 | 0 |  |
Affiliated companies | 237 | 417 |  |
Other | 0 | 8 |  |
Notes receivable from affiliated companies | 1,366 | 1,294 |  |
Materials and supplies | 82 | 80 |  |
Derivatives | 0 | 0 |  |
Collateral | 0 | 0 |  |
Prepaid taxes and other | 0 | 1 |  |
Total current assets | 1,685 | 1,800 |  |
PROPERTY, PLANT AND EQUIPMENT: |  |  |  |
In service | 4,981 | 4,703 |  |
Less — Accumulated provision for depreciation | 4,248 | 4,144 |  |
Property, plant and equipment in service net of accumulated provision for depreciation | 733 | 559 |  |
Construction work in progress | 242 | 358 |  |
Total net property, plant and equipment | 975 | 917 |  |
INVESTMENTS: |  |  |  |
Nuclear plant decommissioning trusts | 1,793 | 1,552 |  |
Investment in affiliated companies | 0 | 0 |  |
Other | 0 | 1 |  |
Total other property and investments | 1,793 | 1,553 |  |
DEFERRED CHARGES AND OTHER ASSETS: |  |  |  |
Property taxes | 14 | 28 |  |
Accumulated deferred income tax benefits | 738 | 883 |  |
Derivatives | 0 | 0 |  |
Other | 0 | 0 |  |
Total deferred charges and other assets | 752 | 911 |  |
Total assets | 5,205 | 5,181 |  |
CURRENT LIABILITIES: |  |  |  |
Currently payable long-term debt | 99 | 5 |  |
Accounts payable- |  |  |  |
Affiliated companies | 168 | 406 |  |
Other | 0 | 0 |  |
Accrued taxes | 59 | 61 |  |
Derivatives | 0 | 0 |  |
Other | 10 | 10 |  |
Total current liabilities | 336 | 482 |  |
CAPITALIZATION: |  |  |  |
Total equity | 2,217 | 2,006 |  |
Long-term debt and other long-term obligations | 1,022 | 1,120 |  |
Total capitalization | 3,239 | 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 | 787 | 713 |  |
Derivatives | 0 | 0 |  |
Other | 843 | 860 |  |
Total noncurrent liabilities | 1,630 | 1,573 |  |
Total liabilities and capitalization | 5,205 | 5,181 |  |
NG | Affiliates |  |  |  |
CURRENT LIABILITIES: |  |  |  |
Short-term borrowings - affiliated companies | 0 | 0 |  |
Consolidated |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 2 | 2 | $ 2 | $ 2
Receivables- |  |  |  |
Customers | 185 | 213 |  |
Affiliated companies | 385 | 452 |  |
Other | 12 | 27 |  |
Notes receivable from affiliated companies | 0 | 29 |  |
Materials and supplies | 260 | 267 |  |
Derivatives | 41 | 137 |  |
Collateral | 111 | 157 |  |
Prepaid taxes and other | 51 | 63 |  |
Total current assets | 1,047 | 1,347 |  |
PROPERTY, PLANT AND EQUIPMENT: |  |  |  |
In service | 7,382 | 7,057 |  |
Less — Accumulated provision for depreciation | 6,055 | 5,929 |  |
Property, plant and equipment in service net of accumulated provision for depreciation | 1,327 | 1,128 |  |
Construction work in progress | 299 | 427 |  |
Total net property, plant and equipment | 1,626 | 1,555 |  |
INVESTMENTS: |  |  |  |
Nuclear plant decommissioning trusts | 1,793 | 1,552 |  |
Investment in affiliated companies | 0 | 0 |  |
Other | 9 | 10 |  |
Total other property and investments | 1,802 | 1,562 |  |
DEFERRED CHARGES AND OTHER ASSETS: |  |  |  |
Property taxes | 20 | 40 |  |
Accumulated deferred income tax benefits | 2,108 | 2,279 |  |
Derivatives | 9 | 77 |  |
Other | 379 | 381 |  |
Total deferred charges and other assets | 2,516 | 2,777 |  |
Total assets | 6,991 | 7,241 |  |
CURRENT LIABILITIES: |  |  |  |
Currently payable long-term debt | 255 | 179 |  |
Accounts payable- |  |  |  |
Affiliated companies | 264 | 550 |  |
Other | 91 | 110 |  |
Accrued taxes | 129 | 143 |  |
Derivatives | 18 | 77 |  |
Other | 170 | 156 |  |
Total current liabilities | 1,202 | 1,316 |  |
CAPITALIZATION: |  |  |  |
Total equity | 239 | 218 |  |
Long-term debt and other long-term obligations | 2,573 | 2,813 |  |
Total capitalization | 2,812 | 3,031 |  |
NONCURRENT LIABILITIES: |  |  |  |
Deferred gain on sale and leaseback transaction | 740 | 757 |  |
Accumulated deferred income taxes | 0 | 0 |  |
Retirement benefits | 205 | 197 |  |
Asset retirement obligations | 975 | 901 |  |
Derivatives | 1 | 52 |  |
Other | 1,056 | 987 |  |
Total noncurrent liabilities | 2,977 | 2,894 |  |
Total liabilities and capitalization | 6,991 | 7,241 |  |
Consolidated | Affiliates |  |  |  |
CURRENT LIABILITIES: |  |  |  |
Short-term borrowings - affiliated companies | $ 275 | $ 101 |  |

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