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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]        
Federal statutory income tax rate 35.00% 35.00% 35.00% 35.00%
Income tax credits (9.00%) (10.00%) (11.00%) (10.00%)
State income tax, net of federal income tax benefit 0.00% 2.00% 1.00% 2.00%
Income tax effect of foreign income and credits (1.00%) (2.00%) (4.00%) (3.00%)
Equity income 1.00% 1.00% 1.00% 1.00%
Other, net (2.00%) (0.00%) (1.00%) (0.00%)
Effective income tax rate 24.00% 26.00% 21.00% 25.00%
Production Tax Credit Carryforwards [Abstract]        
Years eligible for federal renewable energy production tax credit     10 years  
Related Party Income Tax Receivable (Payable) [Abstract]        
Related party transaction, cash received for income taxes, net     $ 1,800 $ 764