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Equity (Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Other comprehensive income (loss) before reclassifications $ 31 $ (43) $ 15 $ (35)      
Amounts reclassified from AOCI 1 4 7 11      
Total other comprehensive income (loss), net of tax 32 (39) 22 (24) $ (7) $ (2)  
Impact of disposal of a business   10          
Acquisition of Gulf Power       (1)      
Attributable to noncontrolling interests (3)       (3)    
Attributable to NEE (163)       (163)   $ (169)
Net Unrealized Gains (Losses) on Cash Flow Hedges              
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Beginning balance (2) (27) (46) (55) (27) (55)  
Other comprehensive income (loss) before reclassifications 0 0 0 0      
Amounts reclassified from AOCI 3 2 8 10      
Total other comprehensive income (loss), net of tax 3 2 8 10      
Impact of disposal of a business   23          
Acquisition of Gulf Power       (1)      
Attributable to noncontrolling interests 0       0    
Attributable to NEE 1       1    
Ending balance 1 (2) (38) (46) 1 (38)  
Net Unrealized Gains (Losses) on Available for Sale Securities              
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Beginning balance 2 11 3 (7) 11 (7)  
Other comprehensive income (loss) before reclassifications 14 (8) 7 8      
Amounts reclassified from AOCI 0 (1) (1) 2      
Total other comprehensive income (loss), net of tax 14 (9) 6 10      
Impact of disposal of a business   0          
Acquisition of Gulf Power       0      
Attributable to noncontrolling interests 0       0    
Attributable to NEE 16       16    
Ending balance 16 2 9 3 16 9  
Defined Benefit Pension and Other Benefits Plans              
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Beginning balance (111) (114) (118) (65) (114) (65)  
Other comprehensive income (loss) before reclassifications 0 0 (1) (52)      
Amounts reclassified from AOCI (2) 3 0 (1)      
Total other comprehensive income (loss), net of tax (2) 3 (1) (53)      
Impact of disposal of a business   0          
Acquisition of Gulf Power       0      
Attributable to noncontrolling interests 0       0    
Attributable to NEE (113)       (113)    
Ending balance (113) (111) (119) (118) (113) (119)  
Net Unrealized Gains (Losses) on Foreign Currency Translation              
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Beginning balance (90) (42) (53) (63) (42) (63)  
Other comprehensive income (loss) before reclassifications 17 (35) 8 10      
Amounts reclassified from AOCI 0 0 0 0      
Total other comprehensive income (loss), net of tax 17 (35) 8 10      
Impact of disposal of a business   (13)          
Acquisition of Gulf Power       0      
Attributable to noncontrolling interests (3)       (3)    
Attributable to NEE (70)       (70)    
Ending balance (73) (90) (45) (53) (73) (45)  
Other Comprehensive Income (Loss) Related to Equity Method Investees              
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Beginning balance 3 3 1 2 3 2  
Other comprehensive income (loss) before reclassifications 0 0 1 (1)      
Amounts reclassified from AOCI 0 0 0 0      
Total other comprehensive income (loss), net of tax 0 0 1 (1)      
Impact of disposal of a business   0          
Acquisition of Gulf Power       0      
Attributable to noncontrolling interests 0       0    
Attributable to NEE 3       3    
Ending balance 3 3 2 1 3 2  
AOCI Attributable to Parent [Member]              
AOCI Attributable to Parent, Net of Tax [Roll Forward]              
Beginning balance (198) (169) (213) (188) (169) (188)  
Total other comprehensive income (loss), net of tax 29 (33) 22 (24)      
Ending balance $ (166) $ (198) $ (191) $ (213) $ (166) $ (191)