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Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2014
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, 2014
 
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, 2014
$
(4
)
 
$
(6
)
 
$
(126
)
 
$
(1
)
 
$
(137
)
Other comprehensive income before reclassifications
—

 
1

 
—

 
1

 
2

Amounts reclassified from accumulated other comprehensive income
—

 
—

 
1

 
—

 
1

Net current-period other comprehensive income
—

 
1

 
1

 
1

 
3

Ending balance, June 30, 2014
$
(4
)
 
$
(5
)
 
$
(125
)
 
$
—

 
$
(134
)

 
Changes in Accumulated Other Comprehensive Loss by Component (a)
 
For The Six Months Ended June 30, 2014
 
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, 2013
$
(4
)
 
$
(6
)
 
$
(126
)
 
$
—

 
$
(136
)
Other comprehensive income before reclassifications
—

 
1

 
(2
)
 
—

 
(1
)
Amounts reclassified from accumulated other comprehensive income
—

 
—

 
3

 
—

 
3

Net current-period other comprehensive income
—

 
1

 
1

 
—

 
2

Ending balance, June 30, 2014
$
(4
)
 
$
(5
)
 
$
(125
)
 
$
—

 
$
(134
)
______________________________________
(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 and other postretirement benefits cost (see Note 12).
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,
 
2014
 
2013
 
(In millions)
Emission allowances
$
2

 
$
2

Renewable energy credits
51

 
51

Contract intangible assets
123

 
126

 
176

 
179

Less accumulated amortization
51

 
45

Intangible assets, net
125

 
134

Less current intangible assets
13

 
12

 
$
112

 
$
122