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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, 2019
USD ($)
MWh
MMBTU
bbl
Dec. 31, 2018
USD ($)
MWh
MMBTU
bbl
Interest Rate Swap [Member]    
Derivative [Line Items]    
Notional amount | $ $ 8,700 $ 13,400
Currency Swap [Member]    
Derivative [Line Items]    
Notional amount | $ $ 656 $ 656
Short [Member] | Commodity contract - Power [Member]    
Derivative [Line Items]    
Non-monetary net notional amount (in MWh) | MWh 140 100
Short [Member] | Commodity contract - Natural gas [Member]    
Derivative [Line Items]    
Non-monetary net notional amount (in MMBtu) | MMBTU 1,819 491
Short [Member] | Commodity contract - Oil [Member]    
Derivative [Line Items]    
Non-monetary net notional amount (in barrels) | bbl (16) (30)
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 1 1
FPL [Member] | Long [Member] | Commodity contract - Natural gas [Member]    
Derivative [Line Items]    
Non-monetary net notional amount (in MMBtu) | MMBTU 203 231