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Supplemental Guarantor Information (Details 1) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | $ 399 | $ 199 | $ 551 | $ 131
Receivables- |  |  |  |
Customers | 1,370 | 1,440 |  |
Other | 172 | 175 |  |
Materials and supplies | 543 | 564 |  |
Derivatives | 35 | 140 |  |
Collateral | 146 | 176 |  |
Prepaid taxes and other | 143 | 158 |  |
Total current assets | 2,931 | 2,950 |  |
PROPERTY, PLANT AND EQUIPMENT: |  |  |  |
In service | 44,229 | 43,767 |  |
Less — Accumulated provision for depreciation | 16,086 | 15,731 |  |
Property, plant and equipment in service net of accumulated provision for depreciation | 28,143 | 28,036 |  |
Construction work in progress | 1,355 | 1,351 |  |
Total net property, plant and equipment | 29,498 | 29,387 |  |
INVESTMENTS: |  |  |  |
Nuclear plant decommissioning trusts | 2,632 | 2,514 |  |
Other | 511 | 512 |  |
Total other property and investments | 3,143 | 3,026 |  |
DEFERRED CHARGES AND OTHER ASSETS: |  |  |  |
Other | 742 | 1,153 |  |
Total deferred charges and other assets | 7,289 | 7,785 |  |
Total assets | 43,649 | 43,148 | 51,961 |
CURRENT LIABILITIES: |  |  |  |
Currently payable long-term debt | 1,076 | 1,685 |  |
Accounts payable- |  |  |  |
Accrued taxes | 520 | 580 |  |
Other | 867 | 738 |  |
Total current liabilities | 4,255 | 7,126 |  |
CAPITALIZATION: |  |  |  |
Total equity | 6,406 | 6,241 |  |
Long-term debt and other long-term obligations | 21,089 | 18,192 |  |
Total capitalization | 27,495 | 24,433 |  |
NONCURRENT LIABILITIES: |  |  |  |
Deferred gain on sale and leaseback transaction | 732 | 757 |  |
Accumulated deferred income taxes | 4,225 | 3,765 |  |
Retirement benefits | 3,814 | 3,719 |  |
Asset retirement obligations | 1,550 | 1,482 |  |
Other | 1,435 | 1,704 |  |
Total noncurrent liabilities | 11,899 | 11,589 |  |
Total liabilities and capitalization | 43,649 | 43,148 |  |
Eliminations |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Receivables- |  |  |  |
Customers | 0 | 0 |  |
Affiliated companies | (235) | (612) |  |
Other | 0 | 0 |  |
Notes receivable from affiliated companies | (3,610) | (3,351) |  |
Materials and supplies | 0 | 0 |  |
Derivatives | 0 | 0 |  |
Collateral | 0 | 0 |  |
Prepaid taxes and other | 0 | 0 |  |
Total current assets | (3,845) | (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 | (3,347) | (2,923) |  |
Other | 0 | 0 |  |
Total other property and investments | (3,347) | (2,923) |  |
DEFERRED CHARGES AND OTHER ASSETS: |  |  |  |
Property taxes | 0 | 0 |  |
Accumulated deferred income tax benefits | (273) | (270) |  |
Derivatives | 0 | 0 |  |
Other | 10 | 21 |  |
Total deferred charges and other assets | (263) | (249) |  |
Total assets | (7,547) | (7,238) |  |
CURRENT LIABILITIES: |  |  |  |
Currently payable long-term debt | (27) | (26) |  |
Accounts payable- |  |  |  |
Affiliated companies | (329) | (706) |  |
Other | 0 | 0 |  |
Accrued taxes | (15) | (16) |  |
Derivatives | 0 | 0 |  |
Other | 33 | 36 |  |
Total current liabilities | (3,948) | (4,063) |  |
CAPITALIZATION: |  |  |  |
Total equity | (3,247) | (2,834) |  |
Long-term debt and other long-term obligations | (1,079) | (1,091) |  |
Total capitalization | (4,326) | (3,925) |  |
NONCURRENT LIABILITIES: |  |  |  |
Deferred gain on sale and leaseback transaction | 732 | 757 |  |
Accumulated deferred income taxes | (5) | (7) |  |
Retirement benefits | 0 | 0 |  |
Asset retirement obligations | 0 | 0 |  |
Other | 0 | 0 |  |
Total noncurrent liabilities | 727 | 750 |  |
Total liabilities and capitalization | (7,547) | (7,238) |  |
Eliminations | Affiliates |  |  |  |
CURRENT LIABILITIES: |  |  |  |
Short-term borrowings - affiliated companies | (3,610) | (3,351) |  |
FES |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Receivables- |  |  |  |
Customers | 171 | 213 |  |
Affiliated companies | 194 | 332 |  |
Other | 9 | 17 |  |
Notes receivable from affiliated companies | 364 | 501 |  |
Materials and supplies | 34 | 45 |  |
Derivatives | 31 | 137 |  |
Collateral | 101 | 157 |  |
Prepaid taxes and other | 12 | 38 |  |
Total current assets | 916 | 1,440 |  |
PROPERTY, PLANT AND EQUIPMENT: |  |  |  |
In service | 121 | 120 |  |
Less — Accumulated provision for depreciation | 61 | 52 |  |
Property, plant and equipment in service net of accumulated provision for depreciation | 60 | 68 |  |
Construction work in progress | 2 | 2 |  |
Total net property, plant and equipment | 62 | 70 |  |
INVESTMENTS: |  |  |  |
Nuclear plant decommissioning trusts | 0 | 0 |  |
Investment in affiliated companies | 3,347 | 2,923 |  |
Other | 0 | 0 |  |
Total other property and investments | 3,347 | 2,923 |  |
DEFERRED CHARGES AND OTHER ASSETS: |  |  |  |
Property taxes | 0 | 0 |  |
Accumulated deferred income tax benefits | 428 | 395 |  |
Derivatives | 5 | 77 |  |
Other | 31 | 33 |  |
Total deferred charges and other assets | 464 | 505 |  |
Total assets | 4,789 | 4,938 |  |
CURRENT LIABILITIES: |  |  |  |
Currently payable long-term debt | 0 | 0 |  |
Accounts payable- |  |  |  |
Affiliated companies | 329 | 743 |  |
Other | 11 | 17 |  |
Accrued taxes | 16 | 50 |  |
Derivatives | 10 | 71 |  |
Other | 28 | 56 |  |
Total current liabilities | 3,693 | 3,906 |  |
CAPITALIZATION: |  |  |  |
Total equity | 328 | 218 |  |
Long-term debt and other long-term obligations | 691 | 691 |  |
Total capitalization | 1,019 | 909 |  |
NONCURRENT LIABILITIES: |  |  |  |
Deferred gain on sale and leaseback transaction | 0 | 0 |  |
Accumulated deferred income taxes | 5 | 4 |  |
Retirement benefits | 26 | 25 |  |
Asset retirement obligations | 0 | 0 |  |
Other | 46 | 94 |  |
Total noncurrent liabilities | 77 | 123 |  |
Total liabilities and capitalization | 4,789 | 4,938 |  |
FES | Affiliates |  |  |  |
CURRENT LIABILITIES: |  |  |  |
Short-term borrowings - affiliated companies | 3,299 | 2,969 |  |
FG |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 2 | 2 | 2 | 2
Receivables- |  |  |  |
Customers | 0 | 0 |  |
Affiliated companies | 175 | 315 |  |
Other | 4 | 2 |  |
Notes receivable from affiliated companies | 1,765 | 1,585 |  |
Materials and supplies | 147 | 142 |  |
Derivatives | 0 | 0 |  |
Collateral | 25 | 0 |  |
Prepaid taxes and other | 16 | 24 |  |
Total current assets | 2,134 | 2,070 |  |
PROPERTY, PLANT AND EQUIPMENT: |  |  |  |
In service | 2,587 | 2,524 |  |
Less — Accumulated provision for depreciation | 1,942 | 1,920 |  |
Property, plant and equipment in service net of accumulated provision for depreciation | 645 | 604 |  |
Construction work in progress | 45 | 67 |  |
Total net property, plant and equipment | 690 | 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 | 2 | 12 |  |
Accumulated deferred income tax benefits | 1,212 | 1,271 |  |
Derivatives | 0 | 0 |  |
Other | 328 | 327 |  |
Total deferred charges and other assets | 1,542 | 1,610 |  |
Total assets | 4,375 | 4,360 |  |
CURRENT LIABILITIES: |  |  |  |
Currently payable long-term debt | 180 | 200 |  |
Accounts payable- |  |  |  |
Affiliated companies | 87 | 107 |  |
Other | 87 | 93 |  |
Accrued taxes | 12 | 48 |  |
Derivatives | 2 | 6 |  |
Other | 92 | 54 |  |
Total current liabilities | 957 | 991 |  |
CAPITALIZATION: |  |  |  |
Total equity | 946 | 828 |  |
Long-term debt and other long-term obligations | 1,941 | 2,093 |  |
Total capitalization | 2,887 | 2,921 |  |
NONCURRENT LIABILITIES: |  |  |  |
Deferred gain on sale and leaseback transaction | 0 | 0 |  |
Accumulated deferred income taxes | 0 | 3 |  |
Retirement benefits | 181 | 172 |  |
Asset retirement obligations | 187 | 188 |  |
Other | 163 | 85 |  |
Total noncurrent liabilities | 531 | 448 |  |
Total liabilities and capitalization | 4,375 | 4,360 |  |
FG | Affiliates |  |  |  |
CURRENT LIABILITIES: |  |  |  |
Short-term borrowings - affiliated companies | 497 | 483 |  |
NG |  |  |  |
CURRENT ASSETS: |  |  |  |
Cash and cash equivalents | 0 | 0 | 0 | 0
Receivables- |  |  |  |
Customers | 0 | 0 |  |
Affiliated companies | 193 | 417 |  |
Other | 0 | 8 |  |
Notes receivable from affiliated companies | 1,481 | 1,294 |  |
Materials and supplies | 82 | 80 |  |
Derivatives | 0 | 0 |  |
Collateral | 0 | 0 |  |
Prepaid taxes and other | 1 | 1 |  |
Total current assets | 1,757 | 1,800 |  |
PROPERTY, PLANT AND EQUIPMENT: |  |  |  |
In service | 5,016 | 4,703 |  |
Less — Accumulated provision for depreciation | 4,309 | 4,144 |  |
Property, plant and equipment in service net of accumulated provision for depreciation | 707 | 559 |  |
Construction work in progress | 241 | 358 |  |
Total net property, plant and equipment | 948 | 917 |  |
INVESTMENTS: |  |  |  |
Nuclear plant decommissioning trusts | 1,823 | 1,552 |  |
Investment in affiliated companies | 0 | 0 |  |
Other | 0 | 1 |  |
Total other property and investments | 1,823 | 1,553 |  |
DEFERRED CHARGES AND OTHER ASSETS: |  |  |  |
Property taxes | 4 | 28 |  |
Accumulated deferred income tax benefits | 690 | 883 |  |
Derivatives | 0 | 0 |  |
Other | 0 | 0 |  |
Total deferred charges and other assets | 694 | 911 |  |
Total assets | 5,222 | 5,181 |  |
CURRENT LIABILITIES: |  |  |  |
Currently payable long-term debt | 114 | 5 |  |
Accounts payable- |  |  |  |
Affiliated companies | 143 | 406 |  |
Other | 0 | 0 |  |
Accrued taxes | 19 | 61 |  |
Derivatives | 0 | 0 |  |
Other | 14 | 10 |  |
Total current liabilities | 290 | 482 |  |
CAPITALIZATION: |  |  |  |
Total equity | 2,301 | 2,006 |  |
Long-term debt and other long-term obligations | 1,006 | 1,120 |  |
Total capitalization | 3,307 | 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 | 801 | 713 |  |
Other | 824 | 860 |  |
Total noncurrent liabilities | 1,625 | 1,573 |  |
Total liabilities and capitalization | 5,222 | 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 | 171 | 213 |  |
Affiliated companies | 327 | 452 |  |
Other | 13 | 27 |  |
Notes receivable from affiliated companies | 0 | 29 |  |
Materials and supplies | 263 | 267 |  |
Derivatives | 31 | 137 |  |
Collateral | 126 | 157 |  |
Prepaid taxes and other | 29 | 63 |  |
Total current assets | 962 | 1,347 |  |
PROPERTY, PLANT AND EQUIPMENT: |  |  |  |
In service | 7,443 | 7,057 |  |
Less — Accumulated provision for depreciation | 6,123 | 5,929 |  |
Property, plant and equipment in service net of accumulated provision for depreciation | 1,320 | 1,128 |  |
Construction work in progress | 288 | 427 |  |
Total net property, plant and equipment | 1,608 | 1,555 |  |
INVESTMENTS: |  |  |  |
Nuclear plant decommissioning trusts | 1,823 | 1,552 |  |
Investment in affiliated companies | 0 | 0 |  |
Other | 9 | 10 |  |
Total other property and investments | 1,832 | 1,562 |  |
DEFERRED CHARGES AND OTHER ASSETS: |  |  |  |
Property taxes | 6 | 40 |  |
Accumulated deferred income tax benefits | 2,057 | 2,279 |  |
Derivatives | 5 | 77 |  |
Other | 369 | 381 |  |
Total deferred charges and other assets | 2,437 | 2,777 |  |
Total assets | 6,839 | 7,241 |  |
CURRENT LIABILITIES: |  |  |  |
Currently payable long-term debt | 267 | 179 |  |
Accounts payable- |  |  |  |
Affiliated companies | 230 | 550 |  |
Other | 98 | 110 |  |
Accrued taxes | 32 | 143 |  |
Derivatives | 12 | 77 |  |
Other | 167 | 156 |  |
Total current liabilities | 992 | 1,316 |  |
CAPITALIZATION: |  |  |  |
Total equity | 328 | 218 |  |
Long-term debt and other long-term obligations | 2,559 | 2,813 |  |
Total capitalization | 2,887 | 3,031 |  |
NONCURRENT LIABILITIES: |  |  |  |
Deferred gain on sale and leaseback transaction | 732 | 757 |  |
Accumulated deferred income taxes | 0 | 0 |  |
Retirement benefits | 207 | 197 |  |
Asset retirement obligations | 988 | 901 |  |
Other | 1,033 | 1,039 |  |
Total noncurrent liabilities | 2,960 | 2,894 |  |
Total liabilities and capitalization | 6,839 | 7,241 |  |
Consolidated | Affiliates |  |  |  |
CURRENT LIABILITIES: |  |  |  |
Short-term borrowings - affiliated companies | $ 186 | $ 101 |  |

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