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Debt (Minimum Annual Maturities) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Minimum annual maturities of long-term debt [Abstract]  
2020 $ 2,124
2021 4,323
2022 4,134
2023 1,700
2024 3,380
FPL[Member]  
Minimum annual maturities of long-term debt [Abstract]  
2020 30
2021 68
2022 1,120
2023 537
2024 $ 672