Summary of Significant Accounting and Reporting Policies (Goodwill and Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill:
Goodwill	$ 147	$ 117
Other intangible assets:
Total	346	370
Less accumulated amortization	88	93
Total other intangible assets - net	258	277
Intangible assets, amortization [Abstract]
NextEra Energy Resources' amortization expense	14	18	14
NextEra Energy Resources' future amortization expense - 2012	12
NextEra Energy Resources' future amortization expense - 2013	9
NextEra Energy Resources' future amortization expense - 2014	8
NextEra Energy Resources' future amortization expense - 2015	7
NextEra Energy Resources' future amortization expense - 2016	5
Purchase power agreements [Member]
Other intangible assets:
Weighted average useful lives (years)	19
Total	70	87
Customer lists [Member]
Other intangible assets:
Weighted average useful lives (years)	7
Total	45	34
Other, primarily land and transmission rights, permits and licenses [Member]
Other intangible assets:
Weighted average useful lives (years)	29
Total	231	249
Merchant reporting unit [Member]
Goodwill:
Goodwill	72	72
Wind reporting unit [Member]
Goodwill:
Goodwill	50	45
Fiber-optic telecommunications reporting unit [Member]
Goodwill:
Goodwill	$ 25	$ 0