Commitments and Contingencies (Long-term Purchase Commitment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
FPL [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2020	$ 270		$ 270
2021	1,010		1,010
2022	965		965
2023	945		945
2024	940		940
Thereafter	10,250		10,250
Related Party Transaction, Amounts of Transaction	104	$ 80	280	$ 236
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	105		105
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	1,420		1,420
2021	2,520		2,520
2022	415		415
2023	210		210
2024	210		210
Thereafter	1,440		1,440
Commitment to invest	85		85
Joint Obligations Remainder Current Year	205		205
Joint Obligations Second Year	355		355
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	4,000		4,000
NextEra Energy Resources [Member] | Mountain Valley Pipeline [Member]
Required capacity and/or minimum payments [Abstract]
2021	20		20
2022	70		70
2023	70		70
2024	70		70
Thereafter	$ 1,160		$ 1,160
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	$ 28	$ 81	$ 81