Commitments and Contingencies (Required Capacity and/or Minimum Payments Under Contracts) (Details) (USD $)	12 Months Ended				0 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	May 01, 2017 MMBTU
FPL [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments	$ 485,000,000		$ 487,000,000	$ 523,000,000
Energy payments	299,000,000		263,000,000	276,000,000
FPL [Member] | Jea and Southern Subsidiaries Contract Range 1 [Member]
Long-term Purchase Commitment [Line Items]
Minimum annual purchase commitments (in megawatts)	1,330
FPL [Member] | Jea and Southern Subsidiaries Contract Range 2 [Member]
Long-term Purchase Commitment [Line Items]
Minimum annual purchase commitments (in megawatts)	375
FPL [Member] | Qualifying Facilities Contracts [Member]
Long-term Purchase Commitment [Line Items]
Minimum annual purchase commitments (in megawatts)	705
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					400,000
Long Term Purchase Commitment, Increased Volume Required					600,000
FPL [Member] | Qualifying Facilities Contracts Capacity Payments [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2015	290,000,000	[1]
Capacity payments and/or minimum payments - 2016	250,000,000	[1]
Capacity payments and/or minimum payments - 2017	255,000,000	[1]
Capacity payments and/or minimum payments - 2018	260,000,000	[1]
Capacity payments and/or minimum payments - 2019	265,000,000	[1]
Capacity payments and/or minimum payments - Thereafter	1,700,000,000	[1]
FPL [Member] | JEA and Southern Subsidiaries Capacity Payments [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2015	195,000,000	[1]
Capacity payments and/or minimum payments - 2016	70,000,000	[1]
Capacity payments and/or minimum payments - 2017	50,000,000	[1]
Capacity payments and/or minimum payments - 2018	10,000,000	[1]
Capacity payments and/or minimum payments - 2019	0	[1]
Capacity payments and/or minimum payments - Thereafter	0	[1]
FPL [Member] | Natural Gas Including Transportation and Storage Contract Minimum Payments [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2015	1,175,000,000	[2],[3]
Capacity payments and/or minimum payments - 2016	760,000,000	[2],[3]
Capacity payments and/or minimum payments - 2017	750,000,000	[2],[3]
Capacity payments and/or minimum payments - 2018	830,000,000	[2],[3]
Capacity payments and/or minimum payments - 2019	830,000,000	[2],[3]
Capacity payments and/or minimum payments - Thereafter	13,780,000,000	[2],[3]
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	200,000,000
Capacity payments and/or minimum payments - 2018	295,000,000
Capacity payments and/or minimum payments - 2019	290,000,000
Capacity payments and/or minimum payments - Thereafter	8,245,000,000
FPL [Member] | Coal Including Transportation Contract Minimum Payments [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2015	115,000,000	[2]
Capacity payments and/or minimum payments - 2016	50,000,000	[2]
Capacity payments and/or minimum payments - 2017	35,000,000	[2]
Capacity payments and/or minimum payments - 2018	0	[2]
Capacity payments and/or minimum payments - 2019	0	[2]
Capacity payments and/or minimum payments - Thereafter	0	[2]
NEECH [Member]
Long-term Purchase Commitment [Line Items]
Ownership interest	100.00%
NEECH [Member] | Sabal Trail Transmission, LLC [Member]
Long-term Purchase Commitment [Line Items]
Ownership interest	33.00%
NEER [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2015	1,770,000,000
Capacity payments and/or minimum payments - 2016	860,000,000
Capacity payments and/or minimum payments - 2017	140,000,000
Capacity payments and/or minimum payments - 2018	135,000,000
Capacity payments and/or minimum payments - 2019	85,000,000
Capacity payments and/or minimum payments - Thereafter	390,000,000
NEER [Member] | Contract Group 1 [Member]
Long-term Purchase Commitment [Line Items]
Commitment amount included in capital expenditures	2,700,000,000
Corporate and Other [Member]
Long-term Purchase Commitment [Line Items]
Commitment to invest	45,000,000
Capacity payments and/or minimum payments - 2015	370,000,000	[4],[5]
Capacity payments and/or minimum payments - 2016	880,000,000	[4],[5]
Capacity payments and/or minimum payments - 2017	445,000,000	[4],[5]
Capacity payments and/or minimum payments - 2018	385,000,000	[4],[5]
Capacity payments and/or minimum payments - 2019	70,000,000	[4],[5]
Capacity payments and/or minimum payments - Thereafter	40,000,000	[4],[5]
Joint obligations	$ 555,000,000

[1] Capacity charges under these contracts, substantially all of which are recoverable through the capacity clause, totaled approximately $485 million, $487 million and $523 million for the years ended December 31, 2014, 2013 and 2012, respectively. Energy charges under these contracts, which are recoverable through the fuel clause, totaled approximately $299 million, $263 million and $276 million for the years ended December 31, 2014, 2013 and 2012, respectively.

[2] Recoverable through the fuel clause.

[3] (c)Includes approximately $200 million, $295 million, $290 million and $8,245 million in 2017, 2018, 2019 and thereafter, respectively, of firm commitments, subject to certain conditions as noted above, related to the natural gas transportation agreements with Sabal Trail and Florida Southeast Connection.

[4] Excludes approximately $555 million, in 2015, of joint obligations of NEECH and NEER which are included in the NEER amounts above.

[5] Includes an approximately $45 million commitment to invest in clean power and technology businesses through 2021.