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Derivative Instruments (Net Notional Volumes and Additional Disclosures) (Details)
bbl in Millions, MWh in Millions, MMBTU in Millions, $ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
MWh
MMBTU
bbl
Dec. 31, 2019
USD ($)
MWh
MMBTU
bbl
Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional amount | $ $ 10,500 $ 8,900
Currency Swap [Member]    
Derivative [Line Items]    
Notional amount | $ $ 957 $ 1,000
Short [Member] | Commodity contract - Power [Member]    
Derivative [Line Items]    
Non-monetary net notional amount (in MWh) | MWh 76 81
Short [Member] | Commodity contract - Natural gas [Member]    
Derivative [Line Items]    
Non-monetary net notional amount (in MMBtu) | MMBTU 352 1,723
Short [Member] | Commodity contract - Oil [Member]    
Derivative [Line Items]    
Non-monetary net notional amount (in barrels) | bbl (14) (13)
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 1
FPL [Member] | Long [Member] | Commodity contract - Natural gas [Member]    
Derivative [Line Items]    
Non-monetary net notional amount (in MMBtu) | MMBTU 143 161