Commitments and Contingencies (Long-term Purchase Commitment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
FPL [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2020	$ 535		$ 535
2021	1,010		1,010
2022	990		990
2023	975		975
2024	965		965
Thereafter	11,345		11,345
Related Party Transaction, Amounts of Transaction	97	$ 77	176	$ 156
FPL [Member] | Sabal Trail and Florida Southeast Connection [Member] | Natural Gas, Including Transportation And Storage, Contract Minimum Payments [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2020	210		210
2021	415		415
2022	415		415
2023	410		410
2024	410		410
Thereafter	6,765		6,765
NextEra Energy Resources [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2020	2,380		2,380
2021	1,715		1,715
2022	375		375
2023	195		195
2024	190		190
Thereafter	1,420		1,420
Commitment to invest	95		95
Joint Obligations Remainder Current Year	420		420
Joint Obligations Second Year	20		20
Joint Obligations Third Year	20		20
Joint Obligations Fourth Year	20		20
Joint Obligations Fifth Year	10		10
Joint Obligations After Fifth Year	15		15
NextEra Energy Resources [Member] | Contract Group 1 [Member]
Long-term Purchase Commitment [Line Items]
Commitment amount included in capital expenditures	4,100		4,100
NextEra Energy Resources [Member] | Mountain Valley Pipeline [Member]
Required capacity and/or minimum payments [Abstract]
2021	50		50
2022	70		70
2023	70		70
2024	70		70
Thereafter	$ 1,130		$ 1,130
Equity method investment, ownership percentage	31.00%		31.00%
Consolidation, Eliminations [Member] | FPL [Member]
Required capacity and/or minimum payments [Abstract]
Related Party Transaction, Amounts of Transaction	$ 27	$ 26	$ 54	$ 53