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Fair Value Measurements (Details) (Recurring, USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Assets    
Fair value, assets $ 2,886 $ 2,822
Liabilities    
Fair value, liabilities (573) (597)
Net assets (liabilities) 2,313 [1] 2,225 [1]
FES
    
Assets    
Fair value, assets 1,583 1,447
Liabilities    
Fair value, liabilities (178) (160)
Net assets (liabilities) 1,405 [2] 1,287 [2]
Commodity contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (175) (154)
Commodity contracts | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (174) (154)
FTRs | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (5) (9)
FTRs | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (4) (6)
Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (247) [3] (290) [3]
LCAPP Contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (146) [3] (144) [3]
Corporate debt securities
    
Assets    
Fair value, assets 1,345 1,259
Corporate debt securities | FES
    
Assets    
Fair value, assets 771 703
Commodity contracts | Derivative Assets
    
Assets    
Fair value, assets 269 252
Commodity contracts | Derivative Assets | FES
    
Assets    
Fair value, assets 268 252
FTRs | Derivative Assets
    
Assets    
Fair value, assets 2 8
FTRs | Derivative Assets | FES
    
Assets    
Fair value, assets 2 6
Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 34 [3] 36 [3]
Equity securities
    
Assets    
Fair value, assets 341 [4] 310 [4]
Equity securities | FES
    
Assets    
Fair value, assets 320 [4] 294 [4]
Foreign government debt securities
    
Assets    
Fair value, assets 123 126
Foreign government debt securities | FES
    
Assets    
Fair value, assets 60 61
U.S. government debt securities
    
Assets    
Fair value, assets 180 179
U.S. government debt securities | FES
    
Assets    
Fair value, assets 19 27
U.S. state debt securities
    
Assets    
Fair value, assets 267 299
Other
    
Assets    
Fair value, assets 325 [5] 353 [5]
Other | FES
    
Assets    
Fair value, assets 143 [5] 104 [5]
Level 1
    
Assets    
Fair value, assets 384 436
Liabilities    
Fair value, liabilities 0 (3)
Net assets (liabilities) 384 [1] 433 [1]
Level 1 | FES
    
Assets    
Fair value, assets 327 294
Liabilities    
Fair value, liabilities 0 (3)
Net assets (liabilities) 327 [2] 291 [2]
Level 1 | Commodity contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 (3)
Level 1 | Commodity contracts | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities 0 (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 | Non Utility Generation Contract | 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 7 0
Level 1 | Commodity contracts | Derivative Assets | FES
    
Assets    
Fair value, assets 7 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 | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 0 [3] 0 [3]
Level 1 | Equity securities
    
Assets    
Fair value, assets 341 [4] 310 [4]
Level 1 | Equity securities | FES
    
Assets    
Fair value, assets 320 [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 36 [5] 126 [5]
Level 1 | Other | FES
    
Assets    
Fair value, assets 0 [5] 0 [5]
Level 2
    
Assets    
Fair value, assets 2,466 2,342
Liabilities    
Fair value, liabilities (175) (151)
Net assets (liabilities) 2,291 [1] 2,191 [1]
Level 2 | FES
    
Assets    
Fair value, assets 1,254 1,147
Liabilities    
Fair value, liabilities (174) (151)
Net assets (liabilities) 1,080 [2] 996 [2]
Level 2 | Commodity contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (175) (151)
Level 2 | Commodity contracts | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (174) (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 | Non Utility Generation Contract | 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 1,345 1,259
Level 2 | Corporate debt securities | FES
    
Assets    
Fair value, assets 771 703
Level 2 | Commodity contracts | Derivative Assets
    
Assets    
Fair value, assets 262 252
Level 2 | Commodity contracts | Derivative Assets | FES
    
Assets    
Fair value, assets 261 252
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 | Non Utility Generation Contract | 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 123 126
Level 2 | Foreign government debt securities | FES
    
Assets    
Fair value, assets 60 61
Level 2 | U.S. government debt securities
    
Assets    
Fair value, assets 180 179
Level 2 | U.S. government debt securities | FES
    
Assets    
Fair value, assets 19 27
Level 2 | U.S. state debt securities
    
Assets    
Fair value, assets 267 299
Level 2 | Other
    
Assets    
Fair value, assets 289 [5] 227 [5]
Level 2 | Other | FES
    
Assets    
Fair value, assets 143 [5] 104 [5]
Level 3
    
Assets    
Fair value, assets 36 44
Liabilities    
Fair value, liabilities (398) (443)
Net assets (liabilities) (362) [1] (399) [1]
Level 3 | FES
    
Assets    
Fair value, assets 2 6
Liabilities    
Fair value, liabilities (4) (6)
Net assets (liabilities) (2) [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 (5) (9)
Level 3 | FTRs | Derivative Liabilities | FES
    
Liabilities    
Fair value, liabilities (4) (6)
Level 3 | Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (247) [3] (290) [3]
Level 3 | LCAPP Contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (146) [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 2 8
Level 3 | FTRs | Derivative Assets | FES
    
Assets    
Fair value, assets 2 6
Level 3 | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 34 [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 $(10) million and $110 million as of March 31, 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 $(6) million and $94 million as of March 31, 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.
[5] Primarily consists of short-term cash investments.