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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 |  |

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