Commitments and Contingencies (Long-term Purchase Commitment) (Details) $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
	May 31, 2017 USD ($)	Jan. 31, 2017 USD ($) MW	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) MW	Jun. 30, 2016 USD ($)
FPL [Member]
Long-term Purchase Commitment [Line Items]
Proportionate ownership percentage	20.00%
Termination of operations, future payment	$ 90
Required capacity and/or minimum payments [Abstract]
Capacity payments			$ 20	$ 46	$ 40	$ 93
Energy payments			27	$ 31	43	$ 47
FPL [Member] | Capacity Charges [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2017			40		40
2018			65		65
2019			50		50
2020			20		20
2021			20		20
Thereafter			250		$ 250
FPL [Member] | Take-or-Pay Contract Range 1 [Member]
Long-term Purchase Commitment [Line Items]
Minimum annual purchase commitments (in megawatts) | MW					375
FPL [Member] | Natural Gas, Including Transportation And Storage, Contract Minimum Payments [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2017			765		$ 765
2018			970		970
2019			860		860
2020			910		910
2021			905		905
Thereafter			12,135		12,135
FPL [Member] | Coal Contract Minimum Payments [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2017			70		70
2018			5		5
2019			5		5
2020			0		0
2021			0		0
Thereafter			0		$ 0
FPL [Member] | Pay-for-Performance Contracts [Member]
Long-term Purchase Commitment [Line Items]
Minimum total purchase commitments (in megawatts) | MW					114
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 2017			150		$ 150
2018			295		295
2019			290		290
2020			360		360
2021			390		390
Thereafter			7,565		7,565
JEA [Member]
Long-term Purchase Commitment [Line Items]
Proportionate ownership percentage	80.00%
NextEra Energy Resources [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2017			1,020		1,020
2018			1,195		1,195
2019			150		150
2020			105		105
2021			75		75
Thereafter			315		315
NextEra Energy Resources [Member] | Contract Group 1 [Member]
Long-term Purchase Commitment [Line Items]
Commitment amount included in capital expenditures			2,700		2,700
Indiantown, Florida [Member] | FPL [Member] | Coal Fired Generation Facility [Member]
Long-term Purchase Commitment [Line Items]
Coal fired generating facility capacity (in megawatts) | MW		330
Purchase price		$ 451
Existing debt assumed		218
Other Regulatory Assets (Liabilities) [Member] | Indiantown, Florida [Member] | FPL [Member] | Coal Fired Generation Facility [Member]
Long-term Purchase Commitment [Line Items]
Regulatory asset		$ 451
Regulatory asset amortization period (in years)		9 years
Corporate and Other [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2017			65		65
2018			20		20
2019			0		0
2020			5		5
2021			0		0
Thereafter			0		0
Commitment to invest			25		25
Joint Obligations Of NEECH and NEER included NEER Amounts due in the current year			$ 370		$ 370