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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2013
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax expense is as follows:
 
Three-Month Periods
 
Nine-Month Periods
 
Ended September 30,
 
Ended September 30,
 
2013
 
2012
 
2013
 
2012
 
 
 
 
 
 
 
 
Federal statutory income tax rate
35
 %
 
35
 %
 
35
 %
 
35
 %
Income tax credits
(17
)
 
(16
)
 
(13
)
 
(13
)
State income tax, net of federal income tax benefit
1

 
(1
)
 
2

 
—

Income tax effect of foreign income
(12
)
 
(12
)
 
(6
)
 
(6
)
Equity income
2

 
2

 
2

 
2

Effects of ratemaking
(1
)
 
2

 
(1
)
 
(1
)
Other, net
1

 
(1
)
 
(1
)

(2
)
Effective income tax rate
9
 %
 
9
 %
 
18
 %
 
15
 %