Employee Retirement Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Change in plan assets:
Fair value of plan assets at December 31	$ 3,385	[1]	$ 3,122	[1]
Pension Benefits [Member]
Change in plan assets:
Fair value of plan assets at January 1	3,122		3,233
Actual return on plan assets	362		(3)
Employer contributions	9	[2]	1	[2]
Participant contributions	0		0
Benefit payments	(108)	[2]	(109)	[2]
Fair value of plan assets at December 31	3,385		3,122		3,233
Change in benefit obligation:
Obligation at January 1	2,123	[3]	1,994
Service cost	65		64		59
Interest cost	98		98		102
Participant contributions	0		0
Plan amendments	26	[4]	22	[4]
Actuarial losses (gains) - net	168		54
Benefit payments	(108)	[2]	(109)	[2]
Obligation at December 31	2,372	[3]	2,123	[3]	1,994
Funded status:
Prepaid (accrued) benefit cost at December 31	1,013		999
Accumulated benefit obligation	2,305		2,068
Amounts recognized in the consolidated balance sheets [Abstract]
Prepaid benefit costs	1,031		1,021
Accrued benefit cost included in other current liabilities	(2)		(4)
Accrued benefit cost included in other liabilities	(16)		(18)
Prepaid (accrued) benefit cost at December 31	1,013		999
Components of AOCI:
Unrecognized prior service benefit (cost) (net of $5 tax benefit, $3 tax benefit, $3 tax expense and $2 tax benefit, respectively)	(9)		(5)
Unrecognized gain (loss) (net of $39, $24, $6 and $3 tax benefits, respectively)	(63)		(37)
Total	(72)		(42)
Tax effects on components of AOCI [Abstract]
Tax expense (benefit) related to unrecognized prior service benefit (cost)	(5)		(3)
Tax expense (benefit) related to unrecognized gain (loss)	(39)		(24)
Unrecognized amounts included in regulatory assets (liabilities) [Abstract]
Unrecognized prior service cost (benefit)	30		16
Unrecognized transition obligation	0		0
Unrecognized (gain) loss	154		153
Total	184		169
Weighted-average assumptions used to determine benefit obligations [Abstract]
Discount rate (in hundredths)	4.00%		4.65%
Salary increase (in hundredths)	4.00%		4.00%
Other Benefits [Member]
Change in plan assets:
Fair value of plan assets at January 1	28		32
Actual return on plan assets	1		(2)
Employer contributions	29	[2]	29	[2]
Participant contributions	6		8
Benefit payments	(38)	[2]	(39)	[2]
Fair value of plan assets at December 31	26		28		32
Change in benefit obligation:
Obligation at January 1	427		417
Service cost	5		6		6
Interest cost	18		21		23
Participant contributions	6		8
Plan amendments	(42)	[4]	17	[4]
Actuarial losses (gains) - net	21		(3)
Benefit payments	(38)	[2]	(39)	[2]
Obligation at December 31	397		427		417
Funded status:
Prepaid (accrued) benefit cost at December 31	(371)		(399)
Amounts recognized in the consolidated balance sheets [Abstract]
Prepaid benefit costs	0		0
Accrued benefit cost included in other current liabilities	(28)		(26)
Accrued benefit cost included in other liabilities	(343)		(373)
Prepaid (accrued) benefit cost at December 31	(371)		(399)
Components of AOCI:
Unrecognized prior service benefit (cost) (net of $5 tax benefit, $3 tax benefit, $3 tax expense and $2 tax benefit, respectively)	4		(3)
Unrecognized gain (loss) (net of $39, $24, $6 and $3 tax benefits, respectively)	(6)		(1)
Total	(2)		(4)
Tax effects on components of AOCI [Abstract]
Tax expense (benefit) related to unrecognized prior service benefit (cost)	3		(2)
Tax expense (benefit) related to unrecognized gain (loss)	(6)		(3)
Weighted-average assumptions used to determine benefit obligations [Abstract]
Discount rate (in hundredths)	3.75%		4.75%
Salary increase (in hundredths)	4.00%		4.00%
Health care cost trend rate [Abstract]
Under age 65 medical benefits cost trend rate (in hundredths)	7.75%
Under age 65 prescription drug benefits cost trend rate (in hundredths)	6.75%
Age 65 and over medical benefits cost trend rate (in hundredths)	6.75%
Age 65 and over prescription drug benefits cost trend rate (in hundredths)	6.75%
Number of years medical benefits cost rates are assumed to decrease to reach the ultimate trend rate for those under age 65	11 years
Number of years medical benefits cost rates are assumed to decrease to reach the ultimate trend rate for those age 65 and over	7 years
Number of years prescription drug benefits cost rates are assumed to decrease to reach the ultimate trend rate	7 years
Ultimate trend rate (in hundredths)	5.00%
Year the ultimate trend rate is reached for medical benefits for those under age 65	2024
Year the ultimate trend rate is reached for medical benefits for those age 65 and over	2020
Year the ultimate trend rate is reached for prescription drug benefits	2020
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)	(16)		13
Unrecognized transition obligation	0		2
Unrecognized (gain) loss	58		44
Total	42		59
FPL [Member] | Pension Benefits [Member]
Funded status:
Prepaid (accrued) benefit cost at December 31	1,132		1,080
FPL's Contribution Related to SERP	7		1
Amounts recognized in the consolidated balance sheets [Abstract]
Prepaid benefit costs	1,135		1,088
Accrued benefit cost included in other current liabilities	(2)		(2)
Accrued benefit cost included in other liabilities	(1)		(6)
Prepaid (accrued) benefit cost at December 31	1,132		1,080
FPL [Member] | Other Benefits [Member]
Change in plan assets:
Employer contributions	27		27
Funded status:
Prepaid (accrued) benefit cost at December 31	(261)		(273)
Amounts recognized in the consolidated balance sheets [Abstract]
Prepaid benefit costs	0		0
Accrued benefit cost included in other current liabilities	(23)		(22)
Accrued benefit cost included in other liabilities	(238)		(251)
Prepaid (accrued) benefit cost at December 31	(261)		(273)
Equity Securities [Member]
Change in plan assets:
Fair value of plan assets at December 31	$ 833	[1],[5]	$ 756	[1],[6]
Equity Securities [Member] | Pension Benefits [Member]
Target asset allocations [Abstract]
Equity investments, target allocation percentage (in hundredths)	40.50%
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)	43.50%
Debt Securities [Member] | Other Benefits [Member]
Target asset allocations [Abstract]
Equity investments, target allocation percentage (in hundredths)	40.00%
convertible securities [Member] | Pension Benefits [Member]
Target asset allocations [Abstract]
Equity investments, target allocation percentage (in hundredths)	10.00%
Alternative Investments [Member] | Pension Benefits [Member]
Target asset allocations [Abstract]
Equity investments, target allocation percentage (in hundredths)	6.00%

[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 $7 million and $1 million for 2012 and for 2011, respectively. FPL's portion of contributions related to other benefits was $27 million for 2012 and 2011.

[3] NEE's accumulated pension benefit obligation, which includes no assumption about future salary levels, for its pension plans at December 31, 2012 and 2011 was $2,305 million and $2,068 million, respectively.

[4] In 2012, certain active plan participants in the postretirement plan in other benefits elected a pension credit in lieu of retiree life insurance benefits.

[5] Includes foreign investments of $308 million.

[6] Includes foreign investments of $258 million.