Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Asset retirement obligation, roll forward analysis [Roll Forward]
Beginning balance	$ 1,639		$ 2,418
Liabilities incurred	6		3
Accretion expense	89		137
Liabilities settled			(1)
Revision in estimated cash flows - net	(123)		(918)
Ending balance	1,611		1,639
Restricted funds included in special use funds [Abstract]
Restricted funds	3,742		3,617
FPL [Member]
Asset retirement obligation, roll forward analysis [Roll Forward]
Beginning balance	1,083		1,833
Liabilities incurred	3		0
Accretion expense	58		101
Liabilities settled			0
Revision in estimated cash flows - net	0		(851)	[1]
Ending balance	1,144		1,083
Restricted funds included in special use funds [Abstract]
Restricted funds	2,612		2,512
NextEra Energy Resources [Member]
Asset retirement obligation, roll forward analysis [Roll Forward]
Beginning balance	556		585
Liabilities incurred	3		3
Accretion expense	31		36
Liabilities settled			(1)
Revision in estimated cash flows - net	(123)	[2]	(67)	[3]
Ending balance	467		556
Restricted funds included in special use funds [Abstract]
Restricted funds	$ 1,130		$ 1,105

[1] Primarily reflects the effect of a decrease in the escalation rates used to determine the ultimate projected costs of decommissioning FPL's nuclear units and lower costs due to the expected future reimbursement by the DOE of certain spent fuel storage costs as stipulated by a spent fuel settlement agreement.

[2] Primarily reflects the effect of revised cost estimates and probability assessments regarding when assets will be decommissioned.

[3] Primarily reflects the effect of revised probability assessments regarding when assets will be retired and ultimately decommissioned and lower costs due to the expected future reimbursement by the DOE of certain spent fuel storage costs as stipulated by a spent fuel settlement agreement.