Employee Retirement Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Change in plan assets:
Plan assets, ending balance	$ 3,698	[1]	$ 3,692	[1]
Pension Benefits [Member]
Change in plan assets:
Plan assets, beginning balance	3,692		3,385
Actual return on plan assets	203		455
Employer contributions	3	[2]	1	[2]
Participant contributions	0		0
Benefit payments	(200)	[2]	(149)	[2]
Plan assets, ending balance	3,698		3,692		3,385
Change in benefit obligation:
Obligation, beginning balance	2,254	[3]	2,372
Service cost	63		73		65
Interest cost	102		95		98
Participant contributions	0		0
Plan amendments	(11)		0
Special termination benefits	0		46	[4]	0
Actuarial losses (gains) - net	264		(183)
Benefit payments	(200)	[2]	(149)	[2]
Obligation, ending balance	2,472	[3]	2,254	[3]	2,372
Funded status:
Prepaid (accrued) benefit cost	1,226		1,438
Accumulated benefit obligation	2,417		2,197
Amounts recognized in the consolidated balance sheets [Abstract]
Prepaid benefit costs	1,244		1,456
Accrued benefit cost included in other current liabilities	(4)		(5)
Accrued benefit cost included in other liabilities	(14)		(13)
Prepaid (accrued) benefit cost	1,226		1,438
Components of AOCI:
Unrecognized prior service benefit (cost) (net of $1 and $4 tax benefit and $2 and $2 tax expense, respectively)	(2)		(8)
Unrecognized gain (loss) (net of $10 tax benefit, $18 tax expense and $5 and $3 tax benefit, respectively)	(16)		30
Total	(18)		22
Tax effects on components of AOCI [Abstract]
Tax expense (benefit) related to unrecognized prior service benefit (cost)	(1)		(4)
Tax expense (benefit) related to unrecognized gain (loss)	(10)		18
Unrecognized amounts included in regulatory assets (liabilities) [Abstract]
Unrecognized prior service cost (benefit)	10		25
Unrecognized losses (gains)	128		(98)
Total	138		(73)
Weighted-average assumptions used to determine benefit obligations [Abstract]
Discount rate (in hundredths)	3.95%		4.80%
Salary increase (in hundredths)	4.10%		4.00%
Other Benefits [Member]
Change in plan assets:
Plan assets, beginning balance	26		26
Actual return on plan assets	2		2
Employer contributions	28	[2]	28	[2]
Participant contributions	6		5
Benefit payments	(39)	[2]	(35)	[2]
Plan assets, ending balance	23		26		26
Change in benefit obligation:
Obligation, beginning balance	354		397
Service cost	3		4		5
Interest cost	16		14		18
Participant contributions	6		5
Plan amendments	0		0
Special termination benefits	0		0		0
Actuarial losses (gains) - net	20		(31)
Benefit payments	(39)	[2]	(35)	[2]
Obligation, ending balance	360		354		397
Funded status:
Prepaid (accrued) benefit cost	(337)		(328)
Amounts recognized in the consolidated balance sheets [Abstract]
Prepaid benefit costs	0		0
Accrued benefit cost included in other current liabilities	(23)		(26)
Accrued benefit cost included in other liabilities	(314)		(302)
Prepaid (accrued) benefit cost	(337)		(328)
Components of AOCI:
Unrecognized prior service benefit (cost) (net of $1 and $4 tax benefit and $2 and $2 tax expense, respectively)	3		4
Unrecognized gain (loss) (net of $10 tax benefit, $18 tax expense and $5 and $3 tax benefit, respectively)	(5)		(3)
Total	(2)		1
Tax effects on components of AOCI [Abstract]
Tax expense (benefit) related to unrecognized prior service benefit (cost)	2		2
Tax expense (benefit) related to unrecognized gain (loss)	(5)		(3)
Weighted-average assumptions used to determine benefit obligations [Abstract]
Discount rate (in hundredths)	3.85%		4.60%
Salary increase (in hundredths)	4.10%		4.00%
Health care cost trend rate [Abstract]
Effect of one percentage point increase in assumed health care cost trend rates on accumulated benefit obligation	2
Effect of one percentage point decrease in assumed health care cost trend rates on accumulated benefit obligation	2
SERP and Other Benefits [Member]
Unrecognized amounts included in regulatory assets (liabilities) [Abstract]
Unrecognized prior service cost (benefit)	(13)		(14)
Unrecognized losses (gains)	46		29
Total	33		15
FPL [Member] | Pension Benefits [Member]
Funded status:
Prepaid (accrued) benefit cost	1,186		1,139
FPL's Contribution Related to SERP	1		1
Amounts recognized in the consolidated balance sheets [Abstract]
Prepaid benefit costs	1,189		1,142
Accrued benefit cost included in other current liabilities	(2)		(2)
Accrued benefit cost included in other liabilities	(1)		(1)
Prepaid (accrued) benefit cost	1,186		1,139
FPL [Member] | Other Benefits [Member]
Change in plan assets:
Employer contributions	27		25
Funded status:
Prepaid (accrued) benefit cost	(234)		(249)
Amounts recognized in the consolidated balance sheets [Abstract]
Prepaid benefit costs	0		0
Accrued benefit cost included in other current liabilities	(19)		(22)
Accrued benefit cost included in other liabilities	(215)		(227)
Prepaid (accrued) benefit cost	(234)		(249)
Equity Securities [Member]
Change in plan assets:
Plan assets, ending balance	$ 1,015	[1],[5]	$ 1,028	[1],[6]
Equity Securities [Member] | Pension Benefits [Member]
Target asset allocations [Abstract]
Equity investments, target allocation percentage (in hundredths)	45.00%
Equity Securities [Member] | Other Benefits [Member]
Target asset allocations [Abstract]
Equity investments, target allocation percentage (in hundredths)	60.00%
Debt Securities [Member] | Pension Benefits [Member]
Target asset allocations [Abstract]
Equity investments, target allocation percentage (in hundredths)	32.00%
Debt Securities [Member] | Other Benefits [Member]
Target asset allocations [Abstract]
Equity investments, target allocation percentage (in hundredths)	40.00%
Alternative Investments [Member] | Pension Benefits [Member]
Target asset allocations [Abstract]
Equity investments, target allocation percentage (in hundredths)	13.00%
Convertible Securities [Member] | Pension Benefits [Member]
Target asset allocations [Abstract]
Equity investments, target allocation percentage (in hundredths)	10.00%

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

[2] Employer contributions and benefit payments include only those amounts contributed directly to, or paid directly from, plan assets. FPL's portion of contributions related to SERP benefits was less than $1 million for 2014 and 2013, respectively. FPL's portion of contributions related to other benefits was $27 million and $25 million for 2014 and 2013

[3] NEE's accumulated pension benefit obligation, which includes no assumption about future salary levels, for its pension plans at December 31, 2014 and 2013 was $2,417 million and $2,197 million, respectively.

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

[5] Includes foreign investments of $321 million.

[6] Includes foreign investments of $337 million.