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Fair Value Measurements (Details) - Recurring - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets |  |
Fair value, assets | $ 3,159 | $ 2,876
Liabilities |  |
Fair value, liabilities | (272) | (281)
Net assets (liabilities) | 2,887 | 2,595
FES |  |
Assets |  |
Fair value, assets | 1,744 | 1,559
Liabilities |  |
Fair value, liabilities | (145) | (142)
Net assets (liabilities) | 1,599 | 1,417
Commodity contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (140) | (131)
Commodity contracts | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | (140) | (131)
FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (8) | (13)
FTRs | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | (5) | (11)
NUG contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (124) | (137)
Corporate debt securities |  |
Assets |  |
Fair value, assets | 1,206 | 1,245
Corporate debt securities | FES |  |
Assets |  |
Fair value, assets | 698 | 678
Commodity contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 226 | 228
Commodity contracts | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 226 | 228
FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 17 | 8
FTRs | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 12 | 5
NUG contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 1 | 1
Equity securities |  |
Assets |  |
Fair value, assets | 770 | 576
Equity securities | FES |  |
Assets |  |
Fair value, assets | 495 | 378
Foreign government debt securities |  |
Assets |  |
Fair value, assets | 73 | 75
Foreign government debt securities | FES |  |
Assets |  |
Fair value, assets | 57 | 59
U.S. government debt securities |  |
Assets |  |
Fair value, assets | 189 | 180
U.S. government debt securities | FES |  |
Assets |  |
Fair value, assets | 60 | 23
U.S. state debt securities |  |
Assets |  |
Fair value, assets | 247 | 246
U.S. state debt securities | FES |  |
Assets |  |
Fair value, assets | 4 | 4
Other |  |
Assets |  |
Fair value, assets | 430 | 317
Other | FES |  |
Assets |  |
Fair value, assets | 192 | 184
Level 1 |  |
Assets |  |
Fair value, assets | 981 | 685
Liabilities |  |
Fair value, liabilities | (3) | (9)
Net assets (liabilities) | 978 | 676
Level 1 | FES |  |
Assets |  |
Fair value, assets | 507 | 382
Liabilities |  |
Fair value, liabilities | (3) | (9)
Net assets (liabilities) | 504 | 373
Level 1 | Commodity contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (3) | (9)
Level 1 | Commodity contracts | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | (3) | (9)
Level 1 | FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 1 | FTRs | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 1 | NUG contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 1 | Corporate debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | Corporate debt securities | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | Commodity contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 12 | 4
Level 1 | Commodity contracts | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 12 | 4
Level 1 | FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | FTRs | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | NUG contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | Equity securities |  |
Assets |  |
Fair value, assets | 770 | 576
Level 1 | Equity securities | FES |  |
Assets |  |
Fair value, assets | 495 | 378
Level 1 | Foreign government debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | Foreign government debt securities | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | U.S. government debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | U.S. government debt securities | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | U.S. state debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | U.S. state debt securities | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | Other |  |
Assets |  |
Fair value, assets | 199 | 105
Level 1 | Other | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 2 |  |
Assets |  |
Fair value, assets | 2,160 | 2,182
Liabilities |  |
Fair value, liabilities | (137) | (122)
Net assets (liabilities) | 2,023 | 2,060
Level 2 | FES |  |
Assets |  |
Fair value, assets | 1,225 | 1,172
Liabilities |  |
Fair value, liabilities | (137) | (122)
Net assets (liabilities) | 1,088 | 1,050
Level 2 | Commodity contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (137) | (122)
Level 2 | Commodity contracts | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | (137) | (122)
Level 2 | FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 2 | FTRs | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 2 | NUG contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 2 | Corporate debt securities |  |
Assets |  |
Fair value, assets | 1,206 | 1,245
Level 2 | Corporate debt securities | FES |  |
Assets |  |
Fair value, assets | 698 | 678
Level 2 | Commodity contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 214 | 224
Level 2 | Commodity contracts | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 214 | 224
Level 2 | FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 0
Level 2 | FTRs | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 2 | NUG contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 0
Level 2 | Equity securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 2 | Equity securities | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 2 | Foreign government debt securities |  |
Assets |  |
Fair value, assets | 73 | 75
Level 2 | Foreign government debt securities | FES |  |
Assets |  |
Fair value, assets | 57 | 59
Level 2 | U.S. government debt securities |  |
Assets |  |
Fair value, assets | 189 | 180
Level 2 | U.S. government debt securities | FES |  |
Assets |  |
Fair value, assets | 60 | 23
Level 2 | U.S. state debt securities |  |
Assets |  |
Fair value, assets | 247 | 246
Level 2 | U.S. state debt securities | FES |  |
Assets |  |
Fair value, assets | 4 | 4
Level 2 | Other |  |
Assets |  |
Fair value, assets | 231 | 212
Level 2 | Other | FES |  |
Assets |  |
Fair value, assets | 192 | 184
Level 3 |  |
Assets |  |
Fair value, assets | 18 | 9
Liabilities |  |
Fair value, liabilities | (132) | (150)
Net assets (liabilities) | (114) | (141)
Level 3 | FES |  |
Assets |  |
Fair value, assets | 12 | 5
Liabilities |  |
Fair value, liabilities | (5) | (11)
Net assets (liabilities) | 7 | (6)
Level 3 | Commodity contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 3 | Commodity contracts | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 3 | FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (8) | (13)
Level 3 | FTRs | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | (5) | (11)
Level 3 | NUG contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (124) | (137)
Level 3 | Corporate debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | Corporate debt securities | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | Commodity contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | Commodity contracts | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 17 | 8
Level 3 | FTRs | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 12 | 5
Level 3 | NUG contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 1 | 1
Level 3 | Equity securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | Equity securities | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | Foreign government debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | Foreign government debt securities | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | U.S. government debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | U.S. government debt securities | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | U.S. state debt securities |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | U.S. state debt securities | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | Other |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | Other | FES |  |
Assets |  |
Fair value, assets | $ 0 | $ 0

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