Variable Interest Entities (VIEs) (Details) (USD $) In Millions, unless otherwise specified							3 Months Ended		9 Months Ended					9 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 Other variable interest entities [Member]	Dec. 31, 2012 Other variable interest entities [Member]	Sep. 30, 2013 FPL [Member] Bankruptcy remote special purpose subsidiary [Member]	Dec. 31, 2012 FPL [Member] Bankruptcy remote special purpose subsidiary [Member]	Dec. 31, 2007 FPL [Member] Bankruptcy remote special purpose subsidiary [Member]	Sep. 30, 2013 FPL [Member] Qualifying facility 1 [Member] MWh	Sep. 30, 2012 FPL [Member] Qualifying facility 1 [Member] MWh	Sep. 30, 2013 FPL [Member] Qualifying facility 1 [Member] MW MWh	Sep. 30, 2012 FPL [Member] Qualifying facility 1 [Member] MWh	Sep. 30, 2013 FPL [Member] Qualifying facility 2 [Member] MW	Sep. 30, 2013 FPL [Member] Other variable interest entities [Member]	Dec. 31, 2012 FPL [Member] Other variable interest entities [Member]	Sep. 30, 2013 NextEra Energy Resources [Member]	Sep. 30, 2013 NextEra Energy Resources [Member] Gas and/or oil variable interest entities [Member] MW entities	Dec. 31, 2012 NextEra Energy Resources [Member] Gas and/or oil variable interest entities [Member]	Sep. 30, 2013 NextEra Energy Resources [Member] Wind variable interest entities [Member] MW entities	Dec. 31, 2012 NextEra Energy Resources [Member] Wind variable interest entities [Member]
Variable Interest Entity [Line Items]
Total number of consolidated variable interest entities	12													11	1		10	9
Storm-recovery bonds aggregate principal amount issued						$ 652
Proceeds from issuance of storm-recovery bonds						644
Carrying amount of assets, consolidated variable interest entity				315	366										92	90	4,800	4,600
Carrying amount of liabilities, consolidated variable interest entity				389	447										67	70	3,200	3,200
Coal fired generating facility capacity (in megawatts)									250		330
Quantity of electricity purchased (in megawatt-hours)							287,029	293,650	568,897	582,661
Cost of electricity purchased							41	48	114	133
Ownership percentage														100.00%
Natural gas and or oil electric generating facility capacity (in megawatts)															110
Expiration date of power sales contracts with third parties, low range															2018		2018
Expiration date of power sales contracts with third parties, high range															2020		2037
Wind electric generating facility capability (in megawatts)																	3,219
Total number of consolidated VIEs sell electric output under power sales contracts																	9
Total number of consolidated VIEs sell in spot market																	1
Investments in special purpose entities		$ 711	$ 753									$ 547	$ 583