Employee Retirement Benefits - Additional Disclosures (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Fair value measurements of plan assets [Abstract]
Fair value	$ 3,692	[1]	$ 3,385	[1]
Components of net periodic benefit income (cost) recognized in OCI [Abstract]
Total	(97)		28		45
Employee contribution plans [Abstract]
Defined Contribution Plan, Cost Recognized	46		44		42
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	1,189	[1]	999	[1]
Fair Value, Inputs, Level 2 [Member]
Fair value measurements of plan assets [Abstract]
Fair value	2,276	[1]	2,246	[1]
Significant Unobservable Inputs (Level 3) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	227	[1]	140	[1]
Equity securities [Member]
Fair value measurements of plan assets [Abstract]
Fair value	1,028	[1],[2]	833	[1],[3]
Equity securities [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	1,028	[1],[2]	833	[1],[3]
Foreign investments	337		308
Equity securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value measurements of plan assets [Abstract]
Fair value	0	[1],[2]	0	[1],[3]
Equity securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	0	[1],[2]	0	[1],[3]
Equity commingled vehicles [Member]
Fair value measurements of plan assets [Abstract]
Fair value	656	[1],[4]	590	[1],[5]
Equity commingled vehicles [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	0	[1],[4]	0	[1],[5]
Equity commingled vehicles [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value measurements of plan assets [Abstract]
Fair value	656	[1],[4]	590	[1],[5]
Foreign investments	234		204
Equity commingled vehicles [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	0	[1],[4]	0	[1],[5]
U.S. Government and municipal bonds [Member]
Fair value measurements of plan assets [Abstract]
Fair value	150	[1]	216	[1]
U.S. Government and municipal bonds [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	115	[1]	166	[1]
U.S. Government and municipal bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value measurements of plan assets [Abstract]
Fair value	35	[1]	50	[1]
U.S. Government and municipal bonds [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	0	[1]	0	[1]
Corporate debt securities [Member]
Fair value measurements of plan assets [Abstract]
Fair value	348	[1],[6]	349	[1],[7]
Corporate debt securities [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	0	[1],[6]	0	[1],[7]
Corporate debt securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value measurements of plan assets [Abstract]
Fair value	348	[1],[6]	349	[1],[7]
Foreign investments	67		66
Corporate debt securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	0	[1],[6]	0	[1],[7]
Asset-backed securities [Member]
Fair value measurements of plan assets [Abstract]
Fair value	249	[1]	273	[1]
Asset-backed securities [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	0	[1]	0	[1]
Asset-backed securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value measurements of plan assets [Abstract]
Fair value	249	[1]	273	[1]
Asset-backed securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	0	[1]	0	[1]
Debt security commingled vehicles [Member]
Fair value measurements of plan assets [Abstract]
Fair value	526	[1],[8]	589	[1],[9]
Debt security commingled vehicles [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	0	[1],[8]	0	[1],[9]
Debt security commingled vehicles [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value measurements of plan assets [Abstract]
Fair value	526	[1],[8]	589	[1],[9]
Foreign investments	54		60
Short-term commingled vehicles	145		135
Debt security commingled vehicles [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	0	[1],[8]	0	[1],[9]
Convertible securities [Member]
Fair value measurements of plan assets [Abstract]
Fair value	282	[1]	261	[1]
Convertible securities [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	46	[1]	0	[1]
Convertible securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value measurements of plan assets [Abstract]
Fair value	236	[1]	261	[1]
Convertible securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	0	[1]	0	[1]
Limited partnerships [Member]
Fair value measurements of plan assets [Abstract]
Fair value	453	[1],[10]	274	[1],[11]
Limited partnerships [Member] | Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	0	[1],[10]	0	[1],[11]
Limited partnerships [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value measurements of plan assets [Abstract]
Fair value	226	[1],[10]	134	[1],[11]
Foreign investments	104		39
Alternative investments	129		107
Fixed income oriented commingled investment arrangments	244		90
Convertible security oriented limited partnership investments	80		77
Limited partnerships [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value measurements of plan assets [Abstract]
Fair value	227	[1],[10]	140	[1],[11]
Pension Benefits [Member]
Fair value measurements of plan assets [Abstract]
Fair value	3,692		3,385		3,122
Expected benefit payments, net of government drug subsidy [Abstract]
2014	275
2015	139
2016	146
2017	150
2018	155
2019 - 2023	817
Net periodic benefit (income) cost [Abstract]
Service cost	73		65		64
Interest cost	95		98		98
Expected return on plan assets	(237)		(238)		(238)
Amortization of transition obligation	0		0		0
Amortization of prior service cost (benefit)	7		5		(3)
Amortization of losses	2		0		0
SERP settlements	0		3		0
Special termination benefits	46	[12]	0		0
Net periodic benefit (income) cost	(14)		(67)		(79)
Components of net periodic benefit income (cost) recognized in OCI [Abstract]
Prior service benefit (cost) (net of $3 tax benefit, $4 tax expense and $2 tax benefit, respectively)	0		(6)		0
Net gains (losses) (net of $58 tax expense, $16 tax benefit, $32 tax benefit, $3 tax expense, $3 tax benefit, and $2 tax expense, respectively)	91		(25)		(45)
Amortization of prior service benefit (cost)	2		1		(1)
Amortization of transition obligation	0		0		0
Total	93		(30)		(46)
Tax effects on components of net periodic benefit income (cost) recognized in OCI [Abstract]
Tax expense (benefit) related to prior service cost	0		(3)		0
Tax expense (benefit) related to net gains (losses)	58		(16)		(32)
Components of net periodic benefit (income) cost recognized in regulatory assets (liabilities) [Abstract]
Prior service cost (benefit)	0		17
Unrecognized losses (gains)	(252)		1
Amortization of prior service cost (benefit)	(4)		(3)
Amortization of transition obligation	0		0
Amortization of unrecognized losses	(1)		0
Total	(257)		15
Weighted-average assumptions used to determine net periodic benefit (income) cost [Abstract]
Discount rate (in hundredths)	4.00%		4.65%		5.00%
Salary increase (in hundredths)	4.00%		4.00%		4.00%
Expected long-term rate of return (in hundredths)	7.75%	[13]	7.75%	[13]	7.75%	[13]
Other Benefits [Member]
Fair value measurements of plan assets [Abstract]
Fair value	26		26		28
Anticipated payment for eligible retiree medical expenses on behalf of the other benefits plan during 2014	26
Expected benefit payments, net of government drug subsidy [Abstract]
2014	34
2015	31
2016	29
2017	30
2018	29
2019 - 2023	132
Net periodic benefit (income) cost [Abstract]
Service cost	4		5		6
Interest cost	14		18		21
Expected return on plan assets	(1)		(2)		(2)
Amortization of transition obligation	0		1		3
Amortization of prior service cost (benefit)	(2)		(1)		0
Amortization of losses	2		0		0
SERP settlements	0		0		0
Special termination benefits	0		0		0
Net periodic benefit (income) cost	17		21		28
Components of net periodic benefit income (cost) recognized in OCI [Abstract]
Prior service benefit (cost) (net of $3 tax benefit, $4 tax expense and $2 tax benefit, respectively)	0		7		(3)
Net gains (losses) (net of $58 tax expense, $16 tax benefit, $32 tax benefit, $3 tax expense, $3 tax benefit, and $2 tax expense, respectively)	4		(5)		3
Amortization of prior service benefit (cost)	0		0		0
Amortization of transition obligation	0		0		1
Total	4		2		1
Tax effects on components of net periodic benefit income (cost) recognized in OCI [Abstract]
Tax expense (benefit) related to prior service cost	0		4		(2)
Tax expense (benefit) related to net gains (losses)	3		(3)		2
Weighted-average assumptions used to determine net periodic benefit (income) cost [Abstract]
Discount rate (in hundredths)	3.75%		4.53%	[14]	5.25%
Salary increase (in hundredths)	4.00%		4.00%		4.00%
Expected long-term rate of return (in hundredths)	7.75%	[13]	8.00%	[13]	8.00%	[13]
Other Benefits [Member] | Equity commingled vehicles [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value measurements of plan assets [Abstract]
Fair value	18	[1]	18	[1]
Foreign investments	5		4
Other Benefits [Member] | Debt security commingled vehicles [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value measurements of plan assets [Abstract]
Fair value	6		7
SERP and Other Benefits [Member]
Components of net periodic benefit (income) cost recognized in regulatory assets (liabilities) [Abstract]
Prior service cost (benefit)	0		(29)
Unrecognized losses (gains)	(26)		16
Amortization of prior service cost (benefit)	1		0
Amortization of transition obligation	0		(1)
Amortization of unrecognized losses	(2)		(3)
Total	(27)		(17)
FPL [Member]
Employee contribution plans [Abstract]
Defined Contribution Plan, Cost Recognized	30		29		28
FPL [Member] | Pension Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic benefit (income) cost	(5)		(43)		(51)
FPL [Member] | Other Benefits [Member]
Net periodic benefit (income) cost [Abstract]
Net periodic benefit (income) cost	$ 13		$ 16		$ 21

[1] See Note 4 for discussion of fair value measurement techniques and inputs.

[2] Includes foreign investments of $337 million.

[3] Includes foreign investments of $308 million.

[4] Includes foreign investments of $234 million.

[5] Includes foreign investments of $204 million.

[6] Includes foreign investments of $67 million.

[7] Includes foreign investments of $66 million.

[8] Includes foreign investments of $54 million and $145 million of short-term commingled vehicles.

[9] Includes foreign investments of $60 million and $135 million of short-term commingled vehicles.

[10] Includes foreign investments of $104 million. Also includes fixed income oriented commingled investment arrangements of $244 million, convertible security oriented limited partnerships of $80 million and alternative investments of $129 million. Fair values have been estimated using net asset value (NAV) per share of the investments. Those investments subject to certain restrictions have been classified as Level 3.

[11] Includes foreign investments of $39 million. Also, includes fixed income oriented commingled investment arrangements of $90 million, convertible security oriented limited partnerships of $77 million and alternative investments of $107 million. Fair values have been estimated using NAV per share of the investments. Those investments subject to certain restrictions have been classified as Level 3.

[12] Reflects an enhanced early retirement program offered in 2013 as part of an enterprise-wide cost savings initiative.

[13] In developing the expected long-term rate of return on assets assumption for its plans, NEE evaluated input, including other qualitative and quantitative factors, from its actuaries and consultants, as well as information available in the marketplace. NEE considered different models, capital market return assumptions and historical returns for a portfolio with an equity/bond asset mix similar to its funds. NEE also considered its funds' historical compounded returns.

[14] Reflects a mid-year rate change due to cost remeasurement resulting from a plan amendment.