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Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2013
Accounting Policies [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
 
Changes in Accumulated Other Comprehensive Loss by Component (a)
 
For The Three Months Ended June 30, 2013
 
Net Unrealized Gain/(Loss) on Derivatives
 
Net Unrealized Gain/(Loss) on Investments
 
Benefit Obligations (b)
 
Foreign Currency Translation
 
Total
 
(In millions)
Beginning balance, March 31, 2013
$
(4
)
 
$
(8
)
 
$
(145
)
 
$
1

 
$
(156
)
Other comprehensive income before reclassifications
—

 
—

 
—

 
(1
)
 
(1
)
Amounts reclassified from accumulated other comprehensive income
—

 
—

 
2

 
—

 
2

Net current-period other comprehensive income
—

 
—

 
2

 
(1
)
 
1

Ending balance, June 30, 2013
$
(4
)
 
$
(8
)
 
$
(143
)
 
$
—

 
$
(155
)


 
Changes in Accumulated Other Comprehensive Loss by Component (a)
 
For The Six Months Ended June 30, 2013
 
Net Unrealized Gain/(Loss) on Derivatives
 
Net Unrealized Gain/(Loss) on Investments
 
Benefit Obligations (b)
 
Foreign Currency Translation
 
Total
 
(In millions)
Beginning balance, December 31, 2012
$
(4
)
 
$
(8
)
 
$
(148
)
 
$
2

 
$
(158
)
Other comprehensive income before reclassifications
—

 
—

 
—

 
(2
)
 
(2
)
Amounts reclassified from accumulated other comprehensive income
—

 
—

 
5

 
—

 
5

Net current-period other comprehensive income
—

 
—

 
5

 
(2
)
 
3

Ending balance, June 30, 2013
$
(4
)
 
$
(8
)
 
$
(143
)
 
$
—

 
$
(155
)

______________________________________
(a)
All amounts are net of tax.
(b)
The amounts reclassified from accumulated other comprehensive income are included in the computation of the net periodic pension cost (see Retirement Benefits and Trusteed Assets Note 13).
Schedule of Finite-Lived Intangible Assets by Major Class [Table Text Block]
The Company has certain intangible assets relating to emission allowances, renewable energy credits and non-utility contracts as shown below:
 
June 30,
 
December 31,
 
2013
 
2012
 
(In millions)
Emission allowances
$
4

 
$
6

Renewable energy credits
47

 
44

Contract intangible assets
141

 
139

 
192

 
189

Less accumulated amortization
40

 
34

Intangible assets, net
152

 
155

Less current intangible assets
14

 
20

 
$
138

 
$
135