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Fair Value Measurements (Details) (Recurring, USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Assets    
Fair value, assets $ 2,877 $ 2,865
Liabilities    
Fair value, liabilities (383) (347)
Net assets (liabilities) 2,494 [1] 2,518 [1]
FES
    
Assets    
Fair value, assets 1,624 1,485
Liabilities    
Fair value, liabilities (195) (124)
Net assets (liabilities) 1,429 [2] 1,361 [2]
Commodity contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (187) (113)
Commodity contracts | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (187) (113)
FTRs | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (8) (12)
FTRs | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (8) (11)
NUG contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (188) [3] (222) [3]
Corporate debt securities
    
Assets    
Fair value, assets 1,168 1,365
Corporate debt securities | FES
    
Assets    
Fair value, assets 586 792
Commodity contracts | Derivative Assets
    
Assets    
Fair value, assets 304 215
Commodity contracts | Derivative Assets | FES
    
Assets    
Fair value, assets 305 215
FTRs | Derivative Assets
    
Assets    
Fair value, assets 7 4
FTRs | Derivative Assets | FES
    
Assets    
Fair value, assets 4 3
NUG contracts | Derivative Assets
    
Assets    
Fair value, assets 3 [3] 20 [3]
Equity securities
    
Assets    
Fair value, assets 464 [4] 317 [4]
Equity securities | FES
    
Assets    
Fair value, assets 327 [4] 207 [4]
Foreign government debt securities
    
Assets    
Fair value, assets 94 109
Foreign government debt securities | FES
    
Assets    
Fair value, assets 55 65
U.S. government debt securities
    
Assets    
Fair value, assets 167 165
U.S. government debt securities | FES
    
Assets    
Fair value, assets 25 27
U.S. state debt securities
    
Assets    
Fair value, assets 237 228
U.S. state debt securities | FES
    
Assets    
Fair value, assets 3 0
Other
    
Assets    
Fair value, assets 433 [5] 442 [5]
Other | FES
    
Assets    
Fair value, assets 319 [5] 176 [5]
Level 1
    
Assets    
Fair value, assets 529 511
Liabilities    
Fair value, liabilities (8) (13)
Net assets (liabilities) 521 [1] 498 [1]
Level 1 | FES
    
Assets    
Fair value, assets 338 214
Liabilities    
Fair value, liabilities (8) (13)
Net assets (liabilities) 330 [2] 201 [2]
Level 1 | Commodity contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (8) (13)
Level 1 | Commodity contracts | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (8) (13)
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 [3] 0 [3]
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 11 7
Level 1 | Commodity contracts | Derivative Assets | FES
    
Assets    
Fair value, assets 11 7
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 [3] 0 [3]
Level 1 | Equity securities
    
Assets    
Fair value, assets 464 [4] 317 [4]
Level 1 | Equity securities | FES
    
Assets    
Fair value, assets 327 [4] 207 [4]
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 54 [5] 187 [5]
Level 1 | Other | FES
    
Assets    
Fair value, assets 0 [5] 0 [5]
Level 2
    
Assets    
Fair value, assets 2,338 2,330
Liabilities    
Fair value, liabilities (179) (100)
Net assets (liabilities) 2,159 [1] 2,230 [1]
Level 2 | FES
    
Assets    
Fair value, assets 1,282 1,268
Liabilities    
Fair value, liabilities (179) (100)
Net assets (liabilities) 1,103 [2] 1,168 [2]
Level 2 | Commodity contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (179) (100)
Level 2 | Commodity contracts | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (179) (100)
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 [3] 0 [3]
Level 2 | Corporate debt securities
    
Assets    
Fair value, assets 1,168 1,365
Level 2 | Corporate debt securities | FES
    
Assets    
Fair value, assets 586 792
Level 2 | Commodity contracts | Derivative Assets
    
Assets    
Fair value, assets 293 208
Level 2 | Commodity contracts | Derivative Assets | FES
    
Assets    
Fair value, assets 294 208
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 [3] 0 [3]
Level 2 | Equity securities
    
Assets    
Fair value, assets 0 [4] 0 [4]
Level 2 | Equity securities | FES
    
Assets    
Fair value, assets 0 [4] 0 [4]
Level 2 | Foreign government debt securities
    
Assets    
Fair value, assets 94 109
Level 2 | Foreign government debt securities | FES
    
Assets    
Fair value, assets 55 65
Level 2 | U.S. government debt securities
    
Assets    
Fair value, assets 167 165
Level 2 | U.S. government debt securities | FES
    
Assets    
Fair value, assets 25 27
Level 2 | U.S. state debt securities
    
Assets    
Fair value, assets 237 228
Level 2 | U.S. state debt securities | FES
    
Assets    
Fair value, assets 3 0
Level 2 | Other
    
Assets    
Fair value, assets 379 [5] 255 [5]
Level 2 | Other | FES
    
Assets    
Fair value, assets 319 [5] 176 [5]
Level 3
    
Assets    
Fair value, assets 10 24
Liabilities    
Fair value, liabilities (196) (234)
Net assets (liabilities) (186) [1] (210) [1]
Level 3 | FES
    
Assets    
Fair value, assets 4 3
Liabilities    
Fair value, liabilities (8) (11)
Net assets (liabilities) (4) [2] (8) [2]
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) (12)
Level 3 | FTRs | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (8) (11)
Level 3 | NUG contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (188) [3] (222) [3]
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 7 4
Level 3 | FTRs | Derivative Assets | FES
    
Assets    
Fair value, assets 4 3
Level 3 | NUG contracts | Derivative Assets
    
Assets    
Fair value, assets 3 [3] 20 [3]
Level 3 | Equity securities
    
Assets    
Fair value, assets 0 [4] 0 [4]
Level 3 | Equity securities | FES
    
Assets    
Fair value, assets 0 [4] 0 [4]
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 [5] 0 [5]
Level 3 | Other | FES
    
Assets    
Fair value, assets $ 0 [5] $ 0 [5]
[1] Excludes $9 million and $10 million as of March 31, 2014 and December 31, 2013, respectively, of receivables, payables, taxes and accrued income associated with financial instruments reflected within the fair value table.
[2] Excludes $8 million and $9 million as of March 31, 2014 and December 31, 2013, respectively, of receivables, payables, taxes and accrued income associated with the financial instruments reflected within the fair value table.
[3] NUG contracts are generally subject to regulatory accounting treatment and do not impact earnings.
[4] NDT funds hold equity portfolios whose performance is benchmarked against the Alerian MLP Index or the Wells Fargo Hybrid and Preferred Securities REIT index.
[5] Primarily consists of short-term cash investments.