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Income Taxes (Tables)
 6 Months Ended
Jun. 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
 
Six-Month Periods
 
Ended June 30,
 
Ended June 30,
 
2013
 
2012
 
2013
 
2012
 
 
 
 
 
 
 
 
Federal statutory income tax rate
35
 %
 
35
 %
 
35
 %
 
35
 %
Income tax credits
(6
)
 
(14
)
 
(10
)
 
(12
)
State income tax, net of federal income tax benefit
2

 
(1
)
 
2

 
—

Income tax effect of foreign income
(3
)
 
(3
)
 
(3
)
 
(3
)
Equity income
2

 
2

 
2

 
1

Income tax method change
—

 
(5
)
 
—

 
(2
)
Effects of ratemaking
(1
)
 
—

 
(1
)
 
(1
)
Other, net
(1
)
 
(2
)
 
(1
)

—

Effective income tax rate
28
 %
 
12
 %
 
24
 %
 
18
 %