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Fair Value Measurements (Details) - Recurring - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets |  |
Fair value, assets | $ 3,582 | $ 2,876
Liabilities |  |
Fair value, liabilities | (259) | (281)
Net assets (liabilities) | 3,323 | 2,595
FES |  |
Assets |  |
Fair value, assets | 1,787 | 1,559
Liabilities |  |
Fair value, liabilities | (139) | (142)
Net assets (liabilities) | 1,648 | 1,417
Derivative liabilities - commodity contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (134) | (131)
Derivative liabilities - commodity contracts | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | (134) | (131)
Derivative liabilities - FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (7) | (13)
Derivative liabilities - FTRs | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | (5) | (11)
Derivative liabilities - NUG contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (118) | (137)
Corporate debt securities |  |
Assets |  |
Fair value, assets | 1,242 | 1,245
Corporate debt securities | FES |  |
Assets |  |
Fair value, assets | 714 | 678
Derivative liabilities - commodity contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 237 | 228
Derivative liabilities - commodity contracts | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 237 | 228
Derivative liabilities - FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 13 | 8
Derivative liabilities - FTRs | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 7 | 5
Derivative liabilities - NUG contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 1
Equity securities |  |
Assets |  |
Fair value, assets | 908 | 576
Equity securities | FES |  |
Assets |  |
Fair value, assets | 624 | 378
Foreign government debt securities |  |
Assets |  |
Fair value, assets | 77 | 75
Foreign government debt securities | FES |  |
Assets |  |
Fair value, assets | 59 | 59
U.S. government debt securities |  |
Assets |  |
Fair value, assets | 173 | 180
U.S. government debt securities | FES |  |
Assets |  |
Fair value, assets | 53 | 23
U.S. state debt securities |  |
Assets |  |
Fair value, assets | 255 | 246
U.S. state debt securities | FES |  |
Assets |  |
Fair value, assets | 4 | 4
Other |  |
Assets |  |
Fair value, assets | 677 | 317
Other | FES |  |
Assets |  |
Fair value, assets | 89 | 184
Level 1 |  |
Assets |  |
Fair value, assets | 1,466 | 685
Liabilities |  |
Fair value, liabilities | (12) | (9)
Net assets (liabilities) | 1,454 | 676
Level 1 | FES |  |
Assets |  |
Fair value, assets | 633 | 382
Liabilities |  |
Fair value, liabilities | (12) | (9)
Net assets (liabilities) | 621 | 373
Level 1 | Derivative liabilities - commodity contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (12) | (9)
Level 1 | Derivative liabilities - commodity contracts | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | (12) | (9)
Level 1 | Derivative liabilities - FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 1 | Derivative liabilities - FTRs | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 1 | Derivative liabilities - 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 | Derivative liabilities - commodity contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 7 | 4
Level 1 | Derivative liabilities - commodity contracts | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 7 | 4
Level 1 | Derivative liabilities - FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | Derivative liabilities - FTRs | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | Derivative liabilities - NUG contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 0
Level 1 | Equity securities |  |
Assets |  |
Fair value, assets | 908 | 576
Level 1 | Equity securities | FES |  |
Assets |  |
Fair value, assets | 624 | 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 | 551 | 105
Level 1 | Other | FES |  |
Assets |  |
Fair value, assets | 2 | 0
Level 2 |  |
Assets |  |
Fair value, assets | 2,103 | 2,182
Liabilities |  |
Fair value, liabilities | (122) | (122)
Net assets (liabilities) | 1,981 | 2,060
Level 2 | FES |  |
Assets |  |
Fair value, assets | 1,147 | 1,172
Liabilities |  |
Fair value, liabilities | (122) | (122)
Net assets (liabilities) | 1,025 | 1,050
Level 2 | Derivative liabilities - commodity contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (122) | (122)
Level 2 | Derivative liabilities - commodity contracts | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | (122) | (122)
Level 2 | Derivative liabilities - FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 2 | Derivative liabilities - FTRs | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 2 | Derivative liabilities - NUG contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 2 | Corporate debt securities |  |
Assets |  |
Fair value, assets | 1,242 | 1,245
Level 2 | Corporate debt securities | FES |  |
Assets |  |
Fair value, assets | 714 | 678
Level 2 | Derivative liabilities - commodity contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 230 | 224
Level 2 | Derivative liabilities - commodity contracts | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 230 | 224
Level 2 | Derivative liabilities - FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 0
Level 2 | Derivative liabilities - FTRs | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 2 | Derivative liabilities - 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 | 77 | 75
Level 2 | Foreign government debt securities | FES |  |
Assets |  |
Fair value, assets | 59 | 59
Level 2 | U.S. government debt securities |  |
Assets |  |
Fair value, assets | 173 | 180
Level 2 | U.S. government debt securities | FES |  |
Assets |  |
Fair value, assets | 53 | 23
Level 2 | U.S. state debt securities |  |
Assets |  |
Fair value, assets | 255 | 246
Level 2 | U.S. state debt securities | FES |  |
Assets |  |
Fair value, assets | 4 | 4
Level 2 | Other |  |
Assets |  |
Fair value, assets | 126 | 212
Level 2 | Other | FES |  |
Assets |  |
Fair value, assets | 87 | 184
Level 3 |  |
Assets |  |
Fair value, assets | 13 | 9
Liabilities |  |
Fair value, liabilities | (125) | (150)
Net assets (liabilities) | (112) | (141)
Level 3 | FES |  |
Assets |  |
Fair value, assets | 7 | 5
Liabilities |  |
Fair value, liabilities | (5) | (11)
Net assets (liabilities) | 2 | (6)
Level 3 | Derivative liabilities - commodity contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 3 | Derivative liabilities - commodity contracts | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | 0 | 0
Level 3 | Derivative liabilities - FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (7) | (13)
Level 3 | Derivative liabilities - FTRs | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | (5) | (11)
Level 3 | Derivative liabilities - NUG contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (118) | (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 | Derivative liabilities - commodity contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | Derivative liabilities - commodity contracts | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 0 | 0
Level 3 | Derivative liabilities - FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 13 | 8
Level 3 | Derivative liabilities - FTRs | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 7 | 5
Level 3 | Derivative liabilities - NUG contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 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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