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Income Taxes (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Tax Contingency [Line Items]            
Effective income tax rate (as a percent)   25.00% 26.00% 25.00% 29.00%  
Production tax credits   $ 21 $ 30 $ 44 $ 58  
Deferred income tax benefit associated with convertible investment tax credits   $ 33 $ 42 70 $ 169  
Tax Cuts and Jobs Act of 2017, income tax expense (benefit)       $ 125    
Production tax credit (PTC), roll off period       10 years    
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax liability, income tax (expense) benefit           $ (6,500)
FPL [Member]            
Income Tax Contingency [Line Items]            
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax liability, income tax (expense) benefit           (4,500)
NextEra Energy Resources [Member]            
Income Tax Contingency [Line Items]            
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax liability, income tax (expense) benefit           $ (2,000)
Accounting Standards Update 2018-02 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member]            
Income Tax Contingency [Line Items]            
Cumulative effect on retained earnings, after tax $ (16)