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Derivative Instruments (Net Notional Volumes and Additional Disclosures) (Details)
bbl in Millions, MWh in Millions, MMBTU in Millions, $ in Billions
6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
MWh
MMBTU
bbl
Dec. 31, 2020
USD ($)
MWh
MMBTU
bbl
Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional amount | $ $ 10.8 $ 10.5
Currency Swap [Member]    
Derivative [Line Items]    
Notional amount | $ $ 1.0 $ 1.0
Short [Member] | Commodity contract - Power [Member]    
Derivative [Line Items]    
Non-monetary net notional amount (in MWh) | MWh 95 90
Short [Member] | Commodity contract - Natural gas [Member]    
Derivative [Line Items]    
Non-monetary net notional amount (in MMBtu) | MMBTU 1,194 607
Short [Member] | Commodity contract - Oil [Member]    
Derivative [Line Items]    
Non-monetary net notional amount (in barrels) | bbl (31) (6)
FPL [Member] | Short [Member] | Commodity contract - Oil [Member]    
Derivative [Line Items]    
Non-monetary net notional amount (in barrels) | bbl 0 0
FPL [Member] | Long [Member] | Commodity contract - Power [Member]    
Derivative [Line Items]    
Non-monetary net notional amount (in MWh) | MWh 0 0
FPL [Member] | Long [Member] | Commodity contract - Natural gas [Member]    
Derivative [Line Items]    
Non-monetary net notional amount (in MMBtu) | MMBTU 162 87