Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Federal:
Current(a)	$ 0	[1]	$ (145)	[1]	$ (4)	[1]
Deferred	1,077		853		636
Total federal	1,077		708		632
State:
Current(a)	(29)	[1]	69	[1]	14	[1]
Deferred	128		0		46
Total state	99		69		60
Total income taxes	1,176		777	[2]	692
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory federal income tax rate (in hundredths)	35.00%		35.00%		35.00%
Increases (reductions) resulting from:
State income taxes - net of federal income tax benefit (in hundredths)	1.80%		1.80%		1.50%
PTCs and ITCs - NEER (in hundredths)	(5.10%)		(8.50%)		(7.80%)
Convertible ITCs - NEER (in hundredths)	(1.40%)		(2.50%)		(1.50%)
Valuation allowance associated with Spain solar projects (in hundredths)	0.70%	[3]	5.20%	[3]	0.00%
Charges associated with Canadian assets (in hundredths)	1.30%		0.00%		0.00%
Other - net (in hundredths)	0.00%		0.70%		(0.60%)
Effective income tax rate (in hundredths)	32.30%		31.70%		26.60%
Deferred tax liabilities:
Property-related	11,700		11,247
Pension	489		567
Nuclear decommissioning trusts	258		188
Net unrealized gains on derivatives	390		260
Investments in partnerships and joint ventures	291		166
Other	769		700
Total deferred tax liabilities	13,897		13,128
Deferred tax assets and valuation allowance:
Decommissioning reserves	427		431
Postretirement benefits	154		145
Net operating loss carryforwards	1,070		1,343
Tax credit carryforwards	2,742		2,522
ARO and accrued asset removal costs	737		795
Other	820		959
Valuation allowance(a)	(323)	[4]	(325)	[4]
Net deferred tax assets	5,627		5,870
Net accumulated deferred income taxes	8,270		7,258
Deferred tax assets and liabilities included in the consolidated balance sheets [Abstract]
Deferred income taxes - current assets	739		753
Noncurrent other assets	264		139
Other current liabilities	(12)		(6)
Deferred income taxes - noncurrent liabilities	(9,261)		(8,144)
Net accumulated deferred income taxes	(8,270)		(7,258)
FPL [Member]
Federal:
Current(a)	240	[1]	174	[1]	(261)	[1]
Deferred	542		540		906
Total federal	782		714		645
State:
Current(a)	68	[1]	44	[1]	26	[1]
Deferred	60		77		81
Total state	128		121		107
Total income taxes	910		835		752
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory federal income tax rate (in hundredths)	35.00%		35.00%		35.00%
Increases (reductions) resulting from:
State income taxes - net of federal income tax benefit (in hundredths)	3.40%		3.60%		3.50%
PTCs and ITCs - NEER (in hundredths)	0.00%		0.00%		0.00%
Convertible ITCs - NEER (in hundredths)	0.00%		0.00%		0.00%
Valuation allowance associated with Spain solar projects (in hundredths)	0.00%		0.00%		0.00%
Charges associated with Canadian assets (in hundredths)	0.00%		0.00%		0.00%
Other - net (in hundredths)	(0.90%)		(0.40%)		(0.70%)
Effective income tax rate (in hundredths)	37.50%		38.20%		37.80%
Deferred tax liabilities:
Property-related	7,457		6,948
Pension	459		441
Nuclear decommissioning trusts	0		0
Net unrealized gains on derivatives	0		0
Investments in partnerships and joint ventures	0		0
Other	435		399
Total deferred tax liabilities	8,351		7,788
Deferred tax assets and valuation allowance:
Decommissioning reserves	374		361
Postretirement benefits	99		107
Net operating loss carryforwards	0		96
Tax credit carryforwards	0		0
ARO and accrued asset removal costs	686		670
Other	318		297
Valuation allowance(a)	0		0
Net deferred tax assets	1,477		1,531
Net accumulated deferred income taxes	6,874		6,257
Deferred tax assets and liabilities included in the consolidated balance sheets [Abstract]
Deferred income taxes - current assets	0		98	[5]
Noncurrent other assets	0		0
Other current liabilities	(39)		0
Deferred income taxes - noncurrent liabilities	(6,835)		(6,355)
Net accumulated deferred income taxes	$ (6,874)		$ (6,257)

[1] Includes provision for unrecognized tax benefits.

[2] 2013 amounts were reclassified to conform to current year's presentation. See Note 4 - Nonrecurring Fair Value Measurements.

[3] Reflects a full valuation allowance on deferred tax assets associated with the Spain solar projects. See Note 4 - Nonrecurring Fair Value Measurements

[4] Amount relates to a valuation allowance related to the Spain solar projects, deferred state tax credits and state operating loss carryforwards.

[5] Included in other current assets on FPL's consolidated balance sheets.