Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Asset retirement obligation, roll forward analysis [Roll Forward]
Beginning balance	$ 1,611	$ 1,639
Liabilities incurred	20	6
Accretion expense	94	89
Liabilities settled	(8)
Revision in estimated cash flows - net	(2)	(123)
Ending balance	1,715	1,611
Restricted funds included in special use funds [Abstract]
Restricted funds	4,117	3,742
FPL [Member]
Asset retirement obligation, roll forward analysis [Roll Forward]
Beginning balance	1,144	1,083
Liabilities incurred	9	3
Accretion expense	62	58
Liabilities settled	(8)
Revision in estimated cash flows - net	(1)	0
Ending balance	1,206	1,144
Restricted funds included in special use funds [Abstract]
Restricted funds	2,845	2,612
NextEra Energy Resources [Member]
Asset retirement obligation, roll forward analysis [Roll Forward]
Beginning balance	467	556
Liabilities incurred	11	3
Accretion expense	32	31
Liabilities settled	0
Revision in estimated cash flows - net	(1)	(123)	[1]
Ending balance	509	467
Restricted funds included in special use funds [Abstract]
Restricted funds	$ 1,272	$ 1,130

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