Summary of Significant Accounting and Reporting Policies (Goodwill and Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill:
Goodwill	$ 151	$ 147
Other intangible assets:
Total	198	203
Less accumulated amortization	(102)	(88)
Total other intangible assets - net	96	115
Intangible assets, amortization [Abstract]
NextEra Energy Resources' amortization expense	14	14	18
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	11
Finite-Lived Intangible Assets, Amortization Expense, Year Two	10
Finite-Lived Intangible Assets, Amortization Expense, Year Three	9
Finite-Lived Intangible Assets, Amortization Expense, Year Four	5
Other intangible assets not subject to amortization, primarily land easements	143	143
Finite-Lived Intangible Assets, Amortization Expense, Year Five	5
Purchase power agreements [Member]
Other intangible assets:
Weighted average useful lives (years)	19 years
Total	72	70
Customer lists [Member]
Other intangible assets:
Weighted average useful lives (years)	6 years
Total	39	45
Other, primarily land and transmission rights, permits and licenses [Member]
Other intangible assets:
Weighted average useful lives (years)	28 years
Total	87	88
Merchant reporting unit [Member]
Goodwill:
Goodwill	72	72
Wind reporting unit [Member]
Goodwill:
Goodwill	51	50
Fiber-optic telecommunications reporting unit [Member]
Goodwill:
Goodwill	$ 28	$ 25