Commitments and Contingencies (Long-term Purchase Commitment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
FPL [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2019	$ 750
2020	995
2021	985
2022	975
2023	970
Thereafter	11,500
Related Party Transaction, Amounts of Transaction	79	$ 73
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 2019	240
2020	385
2021	415
2022	415
2023	410
Thereafter	7,175
NextEra Energy Resources [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2019	2,315
2020	1,075
2021	175
2022	185
2023	110
Thereafter	1,380
Commitment to invest	55
NextEra Energy Resources [Member] | Contract Group 1 [Member]
Long-term Purchase Commitment [Line Items]
Commitment amount included in capital expenditures	3,500
NextEra Energy Resources [Member] | Mountain Valley Pipeline [Member]
Required capacity and/or minimum payments [Abstract]
2020	50
2021	65
2022	65
2023	65
Thereafter	$ 1,050
Equity method investment, ownership percentage	31.00%
Corporate and Other [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2019	$ 40
2020	5
2021	5
2022	0
2023	0
Thereafter	0
Joint Obligations Remainder Current Year	25
Joint Obligations Second Year	20
Joint Obligations Third Year	10
Joint Obligations Fourth Year	10
Joint Obligations Fifth Year	5
Consolidation, Eliminations [Member] | FPL [Member]
Required capacity and/or minimum payments [Abstract]
Related Party Transaction, Amounts of Transaction	$ 28	$ 22