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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]    
Federal statutory income tax rate 35.00% 35.00%
Income tax credits (15.00%) (13.00%)
State income tax, net of federal income tax benefit 1.00% 2.00%
Income tax effect of foreign income (3.00%) (3.00%)
Other, net 1.00% (1.00%)
Effective income tax rate 19.00% 20.00%
Production Tax Credit Carryforwards [Abstract]    
Years eligible for federal renewable energy production tax credit 10 years  
Related Party Income Tax Recievable (Payable) [Abstract]    
Related party transaction, cash received for income taxes, net   $ 323