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Employee Retirement Benefits - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits [Member]    
Amounts recognized in the consolidated balance sheets [Abstract]    
Prepaid (accrued) benefit cost $ 1,155 $ 1,244
Weighted-average assumptions used to determine benefit obligations [Abstract]    
Discount rate (in hundredths) 4.35% 3.95%
Salary increase (in hundredths) 4.10% 4.10%
Pension Benefits [Member] | FPL [Member]    
Amounts recognized in the consolidated balance sheets [Abstract]    
Prepaid (accrued) benefit cost $ 1,243 $ 1,189
Pension Benefits [Member] | Equity Securities [Member]    
Target asset allocations [Abstract]    
Equity investments, target allocation percentage (in hundredths) 45.00%  
Pension Benefits [Member] | Debt Securities [Member]    
Target asset allocations [Abstract]    
Equity investments, target allocation percentage (in hundredths) 32.00%  
Pension Benefits [Member] | Alternative Investments [Member]    
Target asset allocations [Abstract]    
Equity investments, target allocation percentage (in hundredths) 13.00%  
Pension Benefits [Member] | Convertible Securities [Member]    
Target asset allocations [Abstract]    
Equity investments, target allocation percentage (in hundredths) 10.00%  
Other Benefits [Member]    
Amounts recognized in the consolidated balance sheets [Abstract]    
Prepaid (accrued) benefit cost $ (321) (355)
Other Benefits [Member] | FPL [Member]    
Amounts recognized in the consolidated balance sheets [Abstract]    
Prepaid (accrued) benefit cost $ (230) $ (237)