Commitments and Contingencies (Long-term Purchase Commitment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
FPL [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2019	$ 250		$ 250
2020	1,005		1,005
2021	1,000		1,000
2022	980		980
2023	975		975
Thereafter	11,525		11,525
Related Party Transaction, Amounts of Transaction	80	$ 76	236	$ 224
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	80		80
2020	385		385
2021	415		415
2022	415		415
2023	410		410
Thereafter	7,175		7,175
NextEra Energy Resources [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2019	1,590		1,590
2020	2,505		2,505
2021	220		220
2022	195		195
2023	120		120
Thereafter	1,480		1,480
Commitment to invest	120		120
NextEra Energy Resources [Member] | Contract Group 1 [Member]
Long-term Purchase Commitment [Line Items]
Commitment amount included in capital expenditures	4,300		4,300
NextEra Energy Resources [Member] | Mountain Valley Pipeline [Member]
Required capacity and/or minimum payments [Abstract]
2021	70		70
2022	70		70
2023	70		70
Thereafter	$ 1,180		$ 1,180
Equity method investment, ownership percentage	31.00%		31.00%
Corporate and Other [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2019	$ 110		$ 110
2020	90		90
2021	75		75
2022	5		5
2023	5		5
Thereafter	50		50
Joint Obligations Remainder Current Year	320		320
Joint Obligations Second Year	305		305
Joint Obligations Third Year	30		30
Joint Obligations Fourth Year	25		25
Joint Obligations Fifth Year	15		15
Joint Obligations After Fifth Year	10		10
Consolidation, Eliminations [Member] | FPL [Member]
Required capacity and/or minimum payments [Abstract]
Related Party Transaction, Amounts of Transaction	$ 28	$ 24	$ 81	$ 69