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Fair Value Measurements (Details) (Recurring, USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Assets    
Fair value, assets $ 2,802 $ 2,822
Liabilities    
Fair value, liabilities (525) (597)
Net assets (liabilities) 2,277 [1] 2,225 [1]
FES
    
Assets    
Fair value, assets 1,461 1,447
Liabilities    
Fair value, liabilities (125) (160)
Net assets (liabilities) 1,336 [2] 1,287 [2]
Commodity contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (112) (154)
Commodity contracts | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (112) (154)
FTRs | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (14) (9)
FTRs | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (13) (6)
NUG contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (233) [3] (290) [3]
LCAPP Contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (166) [3] (144) [3]
Corporate debt securities
    
Assets    
Fair value, assets 1,299 1,259
Corporate debt securities | FES
    
Assets    
Fair value, assets 742 703
Commodity contracts | Derivative Assets
    
Assets    
Fair value, assets 201 252
Commodity contracts | Derivative Assets | FES
    
Assets    
Fair value, assets 201 252
FTRs | Derivative Assets
    
Assets    
Fair value, assets 3 8
FTRs | Derivative Assets | FES
    
Assets    
Fair value, assets 2 6
NUG contracts | Derivative Assets
    
Assets    
Fair value, assets 23 [3] 36 [3]
Equity securities
    
Assets    
Fair value, assets 461 [4] 310 [4]
Equity securities | FES
    
Assets    
Fair value, assets 338 [4] 294 [4]
Foreign government debt securities
    
Assets    
Fair value, assets 101 126
Foreign government debt securities | FES
    
Assets    
Fair value, assets 58 61
U.S. government debt securities
    
Assets    
Fair value, assets 171 179
U.S. government debt securities | FES
    
Assets    
Fair value, assets 26 27
U.S. state debt securities
    
Assets    
Fair value, assets 226 299
Other
    
Assets    
Fair value, assets 317 [5] 353 [5]
Other | FES
    
Assets    
Fair value, assets 94 [5] 104 [5]
Level 1
    
Assets    
Fair value, assets 625 436
Liabilities    
Fair value, liabilities (5) (3)
Net assets (liabilities) 620 [1] 433 [1]
Level 1 | FES
    
Assets    
Fair value, assets 342 294
Liabilities    
Fair value, liabilities (5) (3)
Net assets (liabilities) 337 [2] 291 [2]
Level 1 | Commodity contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (5) (3)
Level 1 | Commodity contracts | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (5) (3)
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 | LCAPP 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 4 0
Level 1 | Commodity contracts | Derivative Assets | FES
    
Assets    
Fair value, assets 4 0
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 461 [4] 310 [4]
Level 1 | Equity securities | FES
    
Assets    
Fair value, assets 338 [4] 294 [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 | Other
    
Assets    
Fair value, assets 160 [5] 126 [5]
Level 1 | Other | FES
    
Assets    
Fair value, assets 0 [5] 0 [5]
Level 2
    
Assets    
Fair value, assets 2,151 2,342
Liabilities    
Fair value, liabilities (107) (151)
Net assets (liabilities) 2,044 [1] 2,191 [1]
Level 2 | FES
    
Assets    
Fair value, assets 1,117 1,147
Liabilities    
Fair value, liabilities (107) (151)
Net assets (liabilities) 1,010 [2] 996 [2]
Level 2 | Commodity contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (107) (151)
Level 2 | Commodity contracts | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (107) (151)
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 | LCAPP Contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 [3] 0 [3]
Level 2 | Corporate debt securities
    
Assets    
Fair value, assets 1,299 1,259
Level 2 | Corporate debt securities | FES
    
Assets    
Fair value, assets 742 703
Level 2 | Commodity contracts | Derivative Assets
    
Assets    
Fair value, assets 197 252
Level 2 | Commodity contracts | Derivative Assets | FES
    
Assets    
Fair value, assets 197 252
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 101 126
Level 2 | Foreign government debt securities | FES
    
Assets    
Fair value, assets 58 61
Level 2 | U.S. government debt securities
    
Assets    
Fair value, assets 171 179
Level 2 | U.S. government debt securities | FES
    
Assets    
Fair value, assets 26 27
Level 2 | U.S. state debt securities
    
Assets    
Fair value, assets 226 299
Level 2 | Other
    
Assets    
Fair value, assets 157 [5] 227 [5]
Level 2 | Other | FES
    
Assets    
Fair value, assets 94 [5] 104 [5]
Level 3
    
Assets    
Fair value, assets 26 44
Liabilities    
Fair value, liabilities (413) (443)
Net assets (liabilities) (387) [1] (399) [1]
Level 3 | FES
    
Assets    
Fair value, assets 2 6
Liabilities    
Fair value, liabilities (13) (6)
Net assets (liabilities) (11) [2] 0 [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 (14) (9)
Level 3 | FTRs | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (13) (6)
Level 3 | NUG contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (233) [3] (290) [3]
Level 3 | LCAPP Contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (166) [3] (144) [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 3 8
Level 3 | FTRs | Derivative Assets | FES
    
Assets    
Fair value, assets 2 6
Level 3 | NUG contracts | Derivative Assets
    
Assets    
Fair value, assets 23 [3] 36 [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 | Other
    
Assets    
Fair value, assets 0 [5] 0 [5]
Level 3 | Other | FES
    
Assets    
Fair value, assets $ 0 [5] $ 0 [5]
[1] Excludes $13 million and $110 million as of September 30, 2013 and December 31, 2012, respectively, of receivables, payables, taxes and accrued income associated with financial instruments reflected within the fair value table.
[2] Excludes $12 million and $94 million as of September 30, 2013 and December 31, 2012, respectively, of receivables, payables, taxes and accrued income associated with the financial instruments reflected within the fair value table.
[3] NUG and LCAPP 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.