Commitments and Contingencies (Required Capacity and/or Minimum Payments Under Contracts) (Details) $ in Millions		12 Months Ended
	May. 01, 2017 MMBTU	Dec. 31, 2015 USD ($) MW	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
FPL [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments		$ 434	$ 485	$ 487
Energy payments		262	$ 299	$ 263
FPL [Member] | Capacity Charges [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2016		185
Capacity payments and/or minimum payments - 2017		170
Capacity payments and/or minimum payments - 2018		140
Capacity payments and/or minimum payments - 2019		120
Capacity payments and/or minimum payments - 2020		110
Capacity payments and/or minimum payments - Thereafter		$ 690
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		444
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 - 2016		$ 1,020
Capacity payments and/or minimum payments - 2017		930
Capacity payments and/or minimum payments - 2018		870
Capacity payments and/or minimum payments - 2019		865
Capacity payments and/or minimum payments - 2020		920
Capacity payments and/or minimum payments - Thereafter		13,050
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 - Thereafter		7,885
FPL [Member] | Coal Including Transportation Contract Minimum Payments [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2016		65
Capacity payments and/or minimum payments - 2017		40
Capacity payments and/or minimum payments - 2018		0
Capacity payments and/or minimum payments - 2019		0
Capacity payments and/or minimum payments - 2020		0
Capacity payments and/or minimum payments - Thereafter		0
NEER [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2016		3,670
Capacity payments and/or minimum payments - 2017		735
Capacity payments and/or minimum payments - 2018		625
Capacity payments and/or minimum payments - 2019		135
Capacity payments and/or minimum payments - 2020		85
Capacity payments and/or minimum payments - Thereafter		535
NEER [Member] | Contract Group 1 [Member]
Long-term Purchase Commitment [Line Items]
Commitment amount included in capital expenditures		$ 5,200
NEER [Member] | Sabal Trail Transmission, LLC [Member]
Long-term Purchase Commitment [Line Items]
Ownership interest		33.00%
Corporate and Other [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2016		$ 60
Capacity payments and/or minimum payments - 2017		5
Capacity payments and/or minimum payments - 2018		5
Capacity payments and/or minimum payments - 2019		0
Capacity payments and/or minimum payments - 2020		5
Capacity payments and/or minimum payments - Thereafter		0
Commitment to invest		35
Joint obligations		$ 1,115