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Fair Value Measurements (Details) - Recurring - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Fair value, assets | $ 3,075 | $ 3,197
Liabilities |  |
Fair value, liabilities | (133) | (238)
Net assets (liabilities) | 2,942 | 2,959
FES |  |
Assets |  |
Fair value, assets | 1,657 | 1,766
Liabilities |  |
Fair value, liabilities | (28) | (129)
Net assets (liabilities) | 1,629 | 1,637
Derivative liabilities - commodity contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (26) | (124)
Derivative liabilities - commodity contracts | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | (26) | (124)
Derivative liabilities - FTRs | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (4) | (6)
Derivative liabilities - FTRs | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | (2) | (5)
Derivative liabilities - NUG contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (103) | (108)
Corporate debt securities |  |
Assets |  |
Fair value, assets | 1,244 | 1,247
Corporate debt securities | FES |  |
Assets |  |
Fair value, assets | 746 | 726
Derivative liabilities - commodity contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 60 | 210
Derivative liabilities - commodity contracts | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 60 | 210
Derivative liabilities - FTRs | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 7
Derivative liabilities - FTRs | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 0 | 4
Derivative liabilities - NUG contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 0 | 1
Equity securities |  |
Assets |  |
Fair value, assets | 982 | 925
Equity securities | FES |  |
Assets |  |
Fair value, assets | 667 | 634
Foreign government debt securities |  |
Assets |  |
Fair value, assets | 95 | 78
Foreign government debt securities | FES |  |
Assets |  |
Fair value, assets | 62 | 58
U.S. government debt securities |  |
Assets |  |
Fair value, assets | 152 | 161
U.S. government debt securities | FES |  |
Assets |  |
Fair value, assets | 30 | 48
U.S. state debt securities |  |
Assets |  |
Fair value, assets | 250 | 246
U.S. state debt securities | FES |  |
Assets |  |
Fair value, assets | 3 | 3
Other |  |
Assets |  |
Fair value, assets | 292 | 322
Other | FES |  |
Assets |  |
Fair value, assets | 89 | 83
Level 1 |  |
Assets |  |
Fair value, assets | 1,146 | 1,134
Liabilities |  |
Fair value, liabilities | 0 | (6)
Net assets (liabilities) | 1,146 | 1,128
Level 1 | FES |  |
Assets |  |
Fair value, assets | 669 | 646
Liabilities |  |
Fair value, liabilities | 0 | (6)
Net assets (liabilities) | 669 | 640
Level 1 | Derivative liabilities - commodity contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | 0 | (6)
Level 1 | Derivative liabilities - commodity contracts | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | 0 | (6)
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 | 0 | 10
Level 1 | Derivative liabilities - commodity contracts | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 0 | 10
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 | 982 | 925
Level 1 | Equity securities | FES |  |
Assets |  |
Fair value, assets | 667 | 634
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 | 164 | 199
Level 1 | Other | FES |  |
Assets |  |
Fair value, assets | 2 | 2
Level 2 |  |
Assets |  |
Fair value, assets | 1,929 | 2,055
Liabilities |  |
Fair value, liabilities | (26) | (118)
Net assets (liabilities) | 1,903 | 1,937
Level 2 | FES |  |
Assets |  |
Fair value, assets | 988 | 1,116
Liabilities |  |
Fair value, liabilities | (26) | (118)
Net assets (liabilities) | 962 | 998
Level 2 | Derivative liabilities - commodity contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (26) | (118)
Level 2 | Derivative liabilities - commodity contracts | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | (26) | (118)
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 | 1,244 | 1,247
Level 2 | Corporate debt securities | FES |  |
Assets |  |
Fair value, assets | 746 | 726
Level 2 | Derivative liabilities - commodity contracts | Derivative Assets |  |
Assets |  |
Fair value, assets | 60 | 200
Level 2 | Derivative liabilities - commodity contracts | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 60 | 200
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 | 95 | 78
Level 2 | Foreign government debt securities | FES |  |
Assets |  |
Fair value, assets | 62 | 58
Level 2 | U.S. government debt securities |  |
Assets |  |
Fair value, assets | 152 | 161
Level 2 | U.S. government debt securities | FES |  |
Assets |  |
Fair value, assets | 30 | 48
Level 2 | U.S. state debt securities |  |
Assets |  |
Fair value, assets | 250 | 246
Level 2 | U.S. state debt securities | FES |  |
Assets |  |
Fair value, assets | 3 | 3
Level 2 | Other |  |
Assets |  |
Fair value, assets | 128 | 123
Level 2 | Other | FES |  |
Assets |  |
Fair value, assets | 87 | 81
Level 3 |  |
Assets |  |
Fair value, assets | 0 | 8
Liabilities |  |
Fair value, liabilities | (107) | (114)
Net assets (liabilities) | (107) | (106)
Level 3 | FES |  |
Assets |  |
Fair value, assets | 0 | 4
Liabilities |  |
Fair value, liabilities | (2) | (5)
Net assets (liabilities) | (2) | (1)
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 | (4) | (6)
Level 3 | Derivative liabilities - FTRs | Derivative Liabilities | FES |  |
Liabilities |  |
Fair value, liabilities | (2) | (5)
Level 3 | Derivative liabilities - NUG contracts | Derivative Liabilities |  |
Liabilities |  |
Fair value, liabilities | (103) | (108)
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 | 0 | 7
Level 3 | Derivative liabilities - FTRs | Derivative Assets | FES |  |
Assets |  |
Fair value, assets | 0 | 4
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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