Employee Retirement Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Change in plan assets:
Fair value of plan assets at December 31	$ 3,122	[1]	$ 3,233	[1]
Pension Benefits [Member]
Change in plan assets:
Fair value of plan assets at January 1	3,233		3,028
Actual return on plan assets	(3)		380
Employer contributions	1	[2]	3	[2]
Transfers	0	[3]	(29)	[3]
Participant contributions	0		0
Benefit payments	(109)	[2]	(149)	[2]
Fair value of plan assets at December 31	3,122		3,233		3,028
Change in benefit obligation:
Obligation at January 1	1,994	[4]	1,866
Service cost	64		59		51
Interest cost	98		102		109
Participant contributions	0		0
Plan amendments	22		1
Special termination benefits	0		13		0
Actuarial losses (gains) - net	54		102
Benefit payments	(109)	[2]	(149)	[2]
Obligation at December 31	2,123	[4]	1,994	[4]	1,866
Funded status:
Prepaid (accrued) benefit cost at December 31	999		1,239
Accumulated benefit obligation	2,068		1,935
Amounts recognized in the consolidated balance sheets [Abstract]
Prepaid benefit costs	1,021		1,259
Accrued benefit cost included in other current liabilities	(4)		(3)
Accrued benefit cost included in other liabilities	(18)		(17)
Prepaid (accrued) benefit cost at December 31	999		1,239
Components of AOCI:
Unrecognized prior service benefit (cost) (net of $3 tax benefit, $2 tax benefit and $2 tax benefit, respectively)	(5)		(4)
Unrecognized transition obligation (net of $1 tax benefit)	0		0
Unrecognized gain (loss) (net of $24 tax benefit, $5 tax expense, $3 tax benefit and $5 tax benefit, respectively)	(37)		8
Total	(42)		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)	(24)		5
Unrecognized amounts included in regulatory assets (liabilities) [Abstract]
Unrecognized prior service cost	16		13
Unrecognized transition obligation	0		0
Unrecognized (gain) loss	153		(64)
Total	169		(51)
Weighted-average assumptions used to determine benefit obligations [Abstract]
Discount rate (in hundredths)	4.65%		5.00%
Salary increase (in hundredths)	4.00%		4.00%
Target asset allocations [Abstract]
Equity investments, target allocation percentage (in hundredths)	43.50%
Fixed income investments, target allocation percentage (in hundredths)	43.50%
Convertible bonds, target allocation percentage (in hundredths)	10.00%
Alternative investments, target allocation percentage (in hundredths)	3.00%
Other Benefits [Member]
Change in plan assets:
Fair value of plan assets at January 1	32		32
Actual return on plan assets	(2)		2
Employer contributions	29	[2]	28	[2]
Transfers	0	[3]	0	[3]
Participant contributions	8		9
Benefit payments	(39)	[2]	(39)	[2]
Fair value of plan assets at December 31	28		32		32
Change in benefit obligation:
Obligation at January 1	417	[4]	430
Service cost	6		6		5
Interest cost	21		23		24
Participant contributions	8		9
Plan amendments	17		0
Special termination benefits	0		0		0
Actuarial losses (gains) - net	(3)		(12)
Benefit payments	(39)	[2]	(39)	[2]
Obligation at December 31	427	[4]	417	[4]	430
Funded status:
Prepaid (accrued) benefit cost at December 31	(399)		(385)
Amounts recognized in the consolidated balance sheets [Abstract]
Prepaid benefit costs	0		0
Accrued benefit cost included in other current liabilities	(26)		(27)
Accrued benefit cost included in other liabilities	(373)		(358)
Prepaid (accrued) benefit cost at December 31	(399)		(385)
Components of AOCI:
Unrecognized prior service benefit (cost) (net of $3 tax benefit, $2 tax benefit and $2 tax benefit, respectively)	(3)		0
Unrecognized transition obligation (net of $1 tax benefit)	0		(1)
Unrecognized gain (loss) (net of $24 tax benefit, $5 tax expense, $3 tax benefit and $5 tax benefit, respectively)	(1)		(4)
Total	(4)		(5)
Tax effects on components of AOCI [Abstract]
Tax expense (benefit) related to unrecognized prior service benefit (cost)	(2)
Tax expense (benefit) related to unrecognized transition obligation			(1)
Tax expense (benefit) related to unrecognized gain (loss)	(3)		(5)
Weighted-average assumptions used to determine benefit obligations [Abstract]
Discount rate (in hundredths)	4.75%		5.25%
Salary increase (in hundredths)	4.00%		4.00%
Health care cost trend rate [Abstract]
Under age 65 medical benefits cost trend rate (in hundredths)	7.30%
Under age 65 prescription drug benefits cost trend rate (in hundredths)	7.90%
Age 65 and over medical benefits cost trend rate (in hundredths)	7.00%
Age 65 and over prescription drug benefits cost trend rate (in hundredths)	7.50%
Number of years medical benefits cost rates are assumed to decrease to reach the ultimate trend rate	6 years
Number of years prescription drug benefits cost rates are assumed to decrease to reach the ultimate trend rate	8 years
Ultimate trend rate (in hundredths)	5.50%
Year the ultimate trend rate is reached for medical benefits	2018
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
Target asset allocations [Abstract]
Equity investments, target allocation percentage (in hundredths)	60.00%
Fixed income investments, target allocation percentage (in hundredths)	40.00%
SERP and Other Benefits [Member]
Unrecognized amounts included in regulatory assets (liabilities) [Abstract]
Unrecognized prior service cost	13		1
Unrecognized transition obligation	2		4
Unrecognized (gain) loss	44		37
Total	$ 59		$ 42

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

[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 $1 million for 2011 and for 2010. FPL's portion of contributions related to other benefits was $27 million and $26 million for 2011 and 2010, respectively.

[3] Represents amounts that were transferred from the qualified pension plan as reimbursement for eligible retiree medical expenses paid by NEE pursuant to the provisions of the Internal Revenue Code.

[4] NEE's accumulated pension benefit obligation, which includes no assumption about future salary levels, for its pension plans at December 31, 2011 and 2010 was $2,068 million and $1,935 million, respectively.