Commitments and Contingencies (Required Capacity and/or Minimum Payments Under Contracts) (Details) $ in Millions		1 Months Ended	12 Months Ended
	May 01, 2017 MMBTU	Jan. 31, 2017 USD ($) MW	Dec. 31, 2016 USD ($) MW	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2015 USD ($)
FPL [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments			$ 175	$ 434	$ 485
Energy payments			126	$ 262	$ 299
FPL [Member] | Capacity Charges [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2017			75
Capacity payments and/or minimum payments - 2018			65
Capacity payments and/or minimum payments - 2019			50
Capacity payments and/or minimum payments - 2020			20
Capacity payments and/or minimum payments - 2021			20
Capacity payments and/or minimum payments - Thereafter			$ 250
FPL [Member] | Take-or-Pay Purchased Power Contract [Member]
Long-term Purchase Commitment [Line Items]
Minimum purchase commitments (in megawatts) | MW			375
FPL [Member] | Pay-for-Performance Contracts [Member]
Long-term Purchase Commitment [Line Items]
Minimum purchase commitments (in megawatts) | MW			114
FPL [Member] | Sabal Trail and Florida Southeast Connection [Member] | Forecast [Member]
Long-term Purchase Commitment [Line Items]
Time period under contracts	25 years
Long Term Purchase Commitment, Initial Volume Required | MMBTU	400,000
Long Term Purchase Commitment, Increased Volume Required | MMBTU	600,000
FPL [Member] | Natural Gas Including Transportation and Storage Contract Minimum Payments [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2017			$ 1,305
Capacity payments and/or minimum payments - 2018			900
Capacity payments and/or minimum payments - 2019			900
Capacity payments and/or minimum payments - 2020			910
Capacity payments and/or minimum payments - 2021			905
Capacity payments and/or minimum payments - Thereafter			12,065
FPL [Member] | Natural Gas Including Transportation and Storage Contract Minimum Payments [Member] | Sabal Trail and Florida Southeast Connection [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2017			200
Capacity payments and/or minimum payments - 2018			295
Capacity payments and/or minimum payments - 2019			290
Capacity payments and/or minimum payments - 2020			360
Capacity payments and/or minimum payments - 2021			390
Capacity payments and/or minimum payments - Thereafter			7,495
FPL [Member] | Coal Including Transportation Contract Minimum Payments [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2017			125
Capacity payments and/or minimum payments - 2018			5
Capacity payments and/or minimum payments - 2019			5
Capacity payments and/or minimum payments - 2020			0
Capacity payments and/or minimum payments - 2021			0
Capacity payments and/or minimum payments - Thereafter			$ 0
FPL [Member] | Coal Fired Generation Facility [Member]
Long-term Purchase Commitment [Line Items]
Termination of Purchased Power Agreement and Purchase Price of Generation Facility						$ 521
Regulatory Assets						$ 847
Regulatory Asset, Amortization Period			9 years
NEER [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2017			$ 1,385
Capacity payments and/or minimum payments - 2018			1,380
Capacity payments and/or minimum payments - 2019			140
Capacity payments and/or minimum payments - 2020			90
Capacity payments and/or minimum payments - 2021			75
Capacity payments and/or minimum payments - Thereafter			285
NEER [Member] | Contract Group 1 [Member]
Long-term Purchase Commitment [Line Items]
Commitment amount included in capital expenditures			$ 3,100
NEER [Member] | Sabal Trail Transmission, LLC [Member]
Long-term Purchase Commitment [Line Items]
Ownership interest			42.50%
Corporate and Other [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2017			$ 45
Capacity payments and/or minimum payments - 2018			10
Capacity payments and/or minimum payments - 2019			0
Capacity payments and/or minimum payments - 2020			5
Capacity payments and/or minimum payments - 2021			0
Capacity payments and/or minimum payments - Thereafter			0
Commitment to invest			30
Joint Obligations due in the next year			263
Joint obligations due in second year			$ 148
Subsequent Event [Member] | 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
Termination of Purchased Power Agreement and Purchase Price of Generation Facility		$ 451
Termination of Purchased Power Agreement and Purchase Price of Generation Facility, Liabilities Assumed		218
Regulatory Assets		$ 451
Regulatory Asset, Amortization Period		9 years