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Fair Value Measurements (Details 5) (Recurring, USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Assets    
Fair value, assets $ 2,801 $ 2,649
Liabilities    
Fair value, liabilities (896) (814)
Net assets (liabilities) 1,905 1,835
FES
    
Assets    
Fair value, assets 1,468 1,378
Liabilities    
Fair value, liabilities (327) (348)
Net assets (liabilities) 1,141 1,030
FES | Level 1
    
Assets    
Fair value, assets 96 0
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 96 0
FES | Level 1 | Corporate debt securities
    
Assets    
Fair value, assets 0 0
FES | Level 1 | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets 0 0
FES | Level 1 | FTRs | Derivative Assets
    
Assets    
Fair value, assets 0  
FES | Level 1 | Equity Securities
    
Assets    
Fair value, assets 96  
FES | Level 1 | Foreign government debt securities
    
Assets    
Fair value, assets 0 0
FES | Level 1 | U.S. government debt securities
    
Assets    
Fair value, assets 0 0
FES | Level 1 | U.S. state debt securities
    
Assets    
Fair value, assets 0 0
FES | Level 1 | Other
    
Assets    
Fair value, assets 0 0
FES | Level 1 | Commodity Contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 0
FES | Level 2
    
Assets    
Fair value, assets 1,370 1,378
Liabilities    
Fair value, liabilities (327) (348)
Net assets (liabilities) 1,043 1,030
FES | Level 2 | Corporate debt securities
    
Assets    
Fair value, assets 562 528
FES | Level 2 | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets 283 241
FES | Level 2 | FTRs | Derivative Assets
    
Assets    
Fair value, assets 0  
FES | Level 2 | Equity Securities
    
Assets    
Fair value, assets 0  
FES | Level 2 | Foreign government debt securities
    
Assets    
Fair value, assets 160 147
FES | Level 2 | U.S. government debt securities
    
Assets    
Fair value, assets 316 308
FES | Level 2 | U.S. state debt securities
    
Assets    
Fair value, assets 7 6
FES | Level 2 | Other
    
Assets    
Fair value, assets 42 148
FES | Level 2 | Commodity Contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (327) (348)
FES | Level 3
    
Assets    
Fair value, assets 2 0
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 2 0
FES | Level 3 | Corporate debt securities
    
Assets    
Fair value, assets 0 0
FES | Level 3 | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets 0 0
FES | Level 3 | FTRs | Derivative Assets
    
Assets    
Fair value, assets 2  
FES | Level 3 | Equity Securities
    
Assets    
Fair value, assets 0  
FES | Level 3 | Foreign government debt securities
    
Assets    
Fair value, assets 0 0
FES | Level 3 | U.S. government debt securities
    
Assets    
Fair value, assets 0 0
FES | Level 3 | U.S. state debt securities
    
Assets    
Fair value, assets 0 0
FES | Level 3 | Other
    
Assets    
Fair value, assets 0 0
FES | Level 3 | Commodity Contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 0
FES | Corporate debt securities
    
Assets    
Fair value, assets 562 528
FES | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets 283 241
FES | FTRs | Derivative Assets
    
Assets    
Fair value, assets 2  
FES | Equity Securities
    
Assets    
Fair value, assets 96  
FES | Foreign government debt securities
    
Assets    
Fair value, assets 160 147
FES | U.S. government debt securities
    
Assets    
Fair value, assets 316 308
FES | U.S. state debt securities
    
Assets    
Fair value, assets 7 6
FES | Other
    
Assets    
Fair value, assets 42 148
FES | Commodity Contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (327) (348)
OE
    
Assets    
Fair value, assets 133 126
OE | Level 1
    
Assets    
Fair value, assets 0 0
OE | Level 1 | U.S. government debt securities
    
Assets    
Fair value, assets 0 0
OE | Level 1 | Other
    
Assets    
Fair value, assets 0 0
OE | Level 2
    
Assets    
Fair value, assets 133 126
OE | Level 2 | U.S. government debt securities
    
Assets    
Fair value, assets 131 124
OE | Level 2 | Other
    
Assets    
Fair value, assets 2 2
OE | Level 3
    
Assets    
Fair value, assets 0 0
OE | Level 3 | U.S. government debt securities
    
Assets    
Fair value, assets 0 0
OE | Level 3 | Other
    
Assets    
Fair value, assets 0 0
OE | U.S. government debt securities
    
Assets    
Fair value, assets 131 124
OE | Other
    
Assets    
Fair value, assets 2 2
TE
    
Assets    
Fair value, assets 79 76
TE | Level 1
    
Assets    
Fair value, assets 26 0
TE | Level 1 | Corporate debt securities
    
Assets    
Fair value, assets 0 0
TE | Level 1 | Equity Securities
    
Assets    
Fair value, assets 26  
TE | Level 1 | U.S. government debt securities
    
Assets    
Fair value, assets 0 0
TE | Level 1 | U.S. state debt securities
    
Assets    
Fair value, assets 0 0
TE | Level 1 | Other
    
Assets    
Fair value, assets 0 0
TE | Level 2
    
Assets    
Fair value, assets 53 76
TE | Level 2 | Corporate debt securities
    
Assets    
Fair value, assets 16 7
TE | Level 2 | Equity Securities
    
Assets    
Fair value, assets 0  
TE | Level 2 | U.S. government debt securities
    
Assets    
Fair value, assets 33 33
TE | Level 2 | U.S. state debt securities
    
Assets    
Fair value, assets 1 1
TE | Level 2 | Other
    
Assets    
Fair value, assets 3 35
TE | Level 3
    
Assets    
Fair value, assets 0 0
TE | Level 3 | Corporate debt securities
    
Assets    
Fair value, assets 0 0
TE | Level 3 | Equity Securities
    
Assets    
Fair value, assets 0  
TE | Level 3 | U.S. government debt securities
    
Assets    
Fair value, assets 0 0
TE | Level 3 | U.S. state debt securities
    
Assets    
Fair value, assets 0 0
TE | Level 3 | Other
    
Assets    
Fair value, assets 0 0
TE | Corporate debt securities
    
Assets    
Fair value, assets 16 7
TE | Equity Securities
    
Assets    
Fair value, assets 26  
TE | U.S. government debt securities
    
Assets    
Fair value, assets 33 33
TE | U.S. state debt securities
    
Assets    
Fair value, assets 1 1
TE | Other
    
Assets    
Fair value, assets 3 35
JCP&L
    
Assets    
Fair value, assets 403 400
Liabilities    
Fair value, liabilities (240) (233)
Net assets (liabilities) 163 167
JCP&L | Level 1
    
Assets    
Fair value, assets 21 96
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 21 96
JCP&L | Level 1 | Corporate debt securities
    
Assets    
Fair value, assets 0 0
JCP&L | Level 1 | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets   0
JCP&L | Level 1 | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 0 0
JCP&L | Level 1 | Equity Securities
    
Assets    
Fair value, assets 21 96
JCP&L | Level 1 | Foreign government debt securities
    
Assets    
Fair value, assets 0  
JCP&L | Level 1 | U.S. government debt securities
    
Assets    
Fair value, assets 0 0
JCP&L | Level 1 | U.S. state debt securities
    
Assets    
Fair value, assets 0 0
JCP&L | Level 1 | Other
    
Assets    
Fair value, assets 0 0
JCP&L | Level 1 | Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 0
JCP&L | Level 2
    
Assets    
Fair value, assets 377 298
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 377 298
JCP&L | Level 2 | Corporate debt securities
    
Assets    
Fair value, assets 81 23
JCP&L | Level 2 | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets   2
JCP&L | Level 2 | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 0 0
JCP&L | Level 2 | Equity Securities
    
Assets    
Fair value, assets 0 0
JCP&L | Level 2 | Foreign government debt securities
    
Assets    
Fair value, assets 13  
JCP&L | Level 2 | U.S. government debt securities
    
Assets    
Fair value, assets 54 33
JCP&L | Level 2 | U.S. state debt securities
    
Assets    
Fair value, assets 215 236
JCP&L | Level 2 | Other
    
Assets    
Fair value, assets 14 4
JCP&L | Level 2 | Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 0
JCP&L | Level 3
    
Assets    
Fair value, assets 5 6
Liabilities    
Fair value, liabilities (240) (233)
Net assets (liabilities) (235) (227)
JCP&L | Level 3 | Corporate debt securities
    
Assets    
Fair value, assets 0 0
JCP&L | Level 3 | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets   0
JCP&L | Level 3 | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 5 6
JCP&L | Level 3 | Equity Securities
    
Assets    
Fair value, assets 0 0
JCP&L | Level 3 | Foreign government debt securities
    
Assets    
Fair value, assets 0  
JCP&L | Level 3 | U.S. government debt securities
    
Assets    
Fair value, assets 0 0
JCP&L | Level 3 | U.S. state debt securities
    
Assets    
Fair value, assets 0 0
JCP&L | Level 3 | Other
    
Assets    
Fair value, assets 0 0
JCP&L | Level 3 | Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (240) (233)
JCP&L | Corporate debt securities
    
Assets    
Fair value, assets 81 23
JCP&L | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets   2
JCP&L | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 5 6
JCP&L | Equity Securities
    
Assets    
Fair value, assets 21 96
JCP&L | Foreign government debt securities
    
Assets    
Fair value, assets 13  
JCP&L | U.S. government debt securities
    
Assets    
Fair value, assets 54 33
JCP&L | U.S. state debt securities
    
Assets    
Fair value, assets 215 236
JCP&L | Other
    
Assets    
Fair value, assets 14 4
JCP&L | Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (240) (233)
Met-Ed
    
Assets    
Fair value, assets 368 414
Liabilities    
Fair value, liabilities (122) (116)
Net assets (liabilities) 246 298
Met-Ed | Level 1
    
Assets    
Fair value, assets 33 160
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 33 160
Met-Ed | Level 1 | Corporate debt securities
    
Assets    
Fair value, assets 0 0
Met-Ed | Level 1 | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets   0
Met-Ed | Level 1 | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 0 0
Met-Ed | Level 1 | Equity Securities
    
Assets    
Fair value, assets 33 160
Met-Ed | Level 1 | Foreign government debt securities
    
Assets    
Fair value, assets 0 0
Met-Ed | Level 1 | U.S. government debt securities
    
Assets    
Fair value, assets 0 0
Met-Ed | Level 1 | U.S. state debt securities
    
Assets    
Fair value, assets 0 0
Met-Ed | Level 1 | Other
    
Assets    
Fair value, assets 0 0
Met-Ed | Level 1 | Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 0
Met-Ed | Level 2
    
Assets    
Fair value, assets 269 142
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 269 142
Met-Ed | Level 2 | Corporate debt securities
    
Assets    
Fair value, assets 138 32
Met-Ed | Level 2 | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets   5
Met-Ed | Level 2 | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 0 0
Met-Ed | Level 2 | Equity Securities
    
Assets    
Fair value, assets 0 0
Met-Ed | Level 2 | Foreign government debt securities
    
Assets    
Fair value, assets 20 1
Met-Ed | Level 2 | U.S. government debt securities
    
Assets    
Fair value, assets 87 88
Met-Ed | Level 2 | U.S. state debt securities
    
Assets    
Fair value, assets 2 2
Met-Ed | Level 2 | Other
    
Assets    
Fair value, assets 22 14
Met-Ed | Level 2 | Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 0
Met-Ed | Level 3
    
Assets    
Fair value, assets 66 112
Liabilities    
Fair value, liabilities (122) (116)
Net assets (liabilities) (56) (4)
Met-Ed | Level 3 | Corporate debt securities
    
Assets    
Fair value, assets 0 0
Met-Ed | Level 3 | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets   0
Met-Ed | Level 3 | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 66 112
Met-Ed | Level 3 | Equity Securities
    
Assets    
Fair value, assets 0 0
Met-Ed | Level 3 | Foreign government debt securities
    
Assets    
Fair value, assets 0 0
Met-Ed | Level 3 | U.S. government debt securities
    
Assets    
Fair value, assets 0 0
Met-Ed | Level 3 | U.S. state debt securities
    
Assets    
Fair value, assets 0 0
Met-Ed | Level 3 | Other
    
Assets    
Fair value, assets 0 0
Met-Ed | Level 3 | Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (122) (116)
Met-Ed | Corporate debt securities
    
Assets    
Fair value, assets 138 32
Met-Ed | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets   5
Met-Ed | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 66 112
Met-Ed | Equity Securities
    
Assets    
Fair value, assets 33 160
Met-Ed | Foreign government debt securities
    
Assets    
Fair value, assets 20 1
Met-Ed | U.S. government debt securities
    
Assets    
Fair value, assets 87 88
Met-Ed | U.S. state debt securities
    
Assets    
Fair value, assets 2 2
Met-Ed | Other
    
Assets    
Fair value, assets 22 14
Met-Ed | Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (122) (116)
Penelec
    
Assets    
Fair value, assets 291 242
Liabilities    
Fair value, liabilities (160) (117)
Net assets (liabilities) 131 125
Penelec | Level 1
    
Assets    
Fair value, assets 20 81
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 20 81
Penelec | Level 1 | Corporate debt securities
    
Assets    
Fair value, assets 0 0
Penelec | Level 1 | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets   0
Penelec | Level 1 | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 0 0
Penelec | Level 1 | Equity Securities
    
Assets    
Fair value, assets 20 81
Penelec | Level 1 | Foreign government debt securities
    
Assets    
Fair value, assets 0  
Penelec | Level 1 | U.S. government debt securities
    
Assets    
Fair value, assets 0 0
Penelec | Level 1 | U.S. state debt securities
    
Assets    
Fair value, assets 0 0
Penelec | Level 1 | Other
    
Assets    
Fair value, assets 0 0
Penelec | Level 1 | Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 0
Penelec | Level 2
    
Assets    
Fair value, assets 267 157
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 267 157
Penelec | Level 2 | Corporate debt securities
    
Assets    
Fair value, assets 69 8
Penelec | Level 2 | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets   2
Penelec | Level 2 | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 0 0
Penelec | Level 2 | Equity Securities
    
Assets    
Fair value, assets 0 0
Penelec | Level 2 | Foreign government debt securities
    
Assets    
Fair value, assets 12  
Penelec | Level 2 | U.S. government debt securities
    
Assets    
Fair value, assets 52 9
Penelec | Level 2 | U.S. state debt securities
    
Assets    
Fair value, assets 81 133
Penelec | Level 2 | Other
    
Assets    
Fair value, assets 53 5
Penelec | Level 2 | Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 0
Penelec | Level 3
    
Assets    
Fair value, assets 4 4
Liabilities    
Fair value, liabilities (160) (117)
Net assets (liabilities) (156) (113)
Penelec | Level 3 | Corporate debt securities
    
Assets    
Fair value, assets 0 0
Penelec | Level 3 | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets   0
Penelec | Level 3 | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 4 4
Penelec | Level 3 | Equity Securities
    
Assets    
Fair value, assets 0 0
Penelec | Level 3 | Foreign government debt securities
    
Assets    
Fair value, assets 0  
Penelec | Level 3 | U.S. government debt securities
    
Assets    
Fair value, assets 0 0
Penelec | Level 3 | U.S. state debt securities
    
Assets    
Fair value, assets 0 0
Penelec | Level 3 | Other
    
Assets    
Fair value, assets 0 0
Penelec | Level 3 | Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (160) (117)
Penelec | Corporate debt securities
    
Assets    
Fair value, assets 69 8
Penelec | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets   2
Penelec | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 4 4
Penelec | Equity Securities
    
Assets    
Fair value, assets 20 81
Penelec | Foreign government debt securities
    
Assets    
Fair value, assets 12  
Penelec | U.S. government debt securities
    
Assets    
Fair value, assets 52 9
Penelec | U.S. state debt securities
    
Assets    
Fair value, assets 81 133
Penelec | Other
    
Assets    
Fair value, assets 53 5
Penelec | Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (160) (117)
Level 1
    
Assets    
Fair value, assets 198 338
Liabilities    
Fair value, liabilities 0 0
Net assets (liabilities) 198 338
Level 1 | Corporate debt securities
    
Assets    
Fair value, assets 0 0
Level 1 | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets 0 0
Level 1 | FTRs | Derivative Assets
    
Assets    
Fair value, assets 0  
Level 1 | Interest Rate Swap | Derivative Assets
    
Assets    
Fair value, assets 0  
Level 1 | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 0 0
Level 1 | Equity Securities
    
Assets    
Fair value, assets 198 338
Level 1 | Foreign government debt securities
    
Assets    
Fair value, assets 0 0
Level 1 | U.S. government debt securities
    
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 0 0
Level 1 | Commodity Contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 0
Level 1 | FTRs | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0  
Level 1 | Interest Rate Swap | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0  
Level 1 | Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 0
Level 2
    
Assets    
Fair value, assets 2,515 2,189
Liabilities    
Fair value, liabilities (367) (348)
Net assets (liabilities) 2,148 1,841
Level 2 | Corporate debt securities
    
Assets    
Fair value, assets 868 597
Level 2 | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets 312 250
Level 2 | FTRs | Derivative Assets
    
Assets    
Fair value, assets 0  
Level 2 | Interest Rate Swap | Derivative Assets
    
Assets    
Fair value, assets 4  
Level 2 | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 0 0
Level 2 | Equity Securities
    
Assets    
Fair value, assets 0 0
Level 2 | Foreign government debt securities
    
Assets    
Fair value, assets 206 149
Level 2 | U.S. government debt securities
    
Assets    
Fair value, assets 673 595
Level 2 | U.S. state debt securities
    
Assets    
Fair value, assets 306 379
Level 2 | Other
    
Assets    
Fair value, assets 146 219
Level 2 | Commodity Contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (362) (348)
Level 2 | FTRs | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0  
Level 2 | Interest Rate Swap | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (5)  
Level 2 | Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 0
Level 3
    
Assets    
Fair value, assets 88 122
Liabilities    
Fair value, liabilities (529) (466)
Net assets (liabilities) (441) (344)
Level 3 | Corporate debt securities
    
Assets    
Fair value, assets 0 0
Level 3 | Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets 0 0
Level 3 | FTRs | Derivative Assets
    
Assets    
Fair value, assets 13  
Level 3 | Interest Rate Swap | Derivative Assets
    
Assets    
Fair value, assets 0  
Level 3 | Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 75 122
Level 3 | Equity Securities
    
Assets    
Fair value, assets 0 0
Level 3 | Foreign government debt securities
    
Assets    
Fair value, assets 0 0
Level 3 | U.S. government debt securities
    
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 0
Level 3 | Commodity Contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0 0
Level 3 | FTRs | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (7)  
Level 3 | Interest Rate Swap | Derivative Liabilities
    
Liabilities    
Fair value, liabilities 0  
Level 3 | Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (522) (466)
Corporate debt securities
    
Assets    
Fair value, assets 868 597
Commodity Contracts | Derivative Assets
    
Assets    
Fair value, assets 312 250
FTRs | Derivative Assets
    
Assets    
Fair value, assets 13  
Interest Rate Swap | Derivative Assets
    
Assets    
Fair value, assets 4  
Non Utility Generation Contract | Derivative Assets
    
Assets    
Fair value, assets 75 122
Equity Securities
    
Assets    
Fair value, assets 198 338
Foreign government debt securities
    
Assets    
Fair value, assets 206 149
U.S. government debt securities
    
Assets    
Fair value, assets 673 595
U.S. state debt securities
    
Assets    
Fair value, assets 306 379
Other
    
Assets    
Fair value, assets 146 219
Commodity Contracts | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (362) (348)
FTRs | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (7)  
Interest Rate Swap | Derivative Liabilities
    
Liabilities    
Fair value, liabilities (5)  
Non Utility Generation Contract | Derivative Liabilities
    
Liabilities    
Fair value, liabilities $ (522) $ (466)