Fair Value Measurements (Nonrecurring Fair Value Measurements) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of Long-Lived Assets Held-for-use	$ 0	$ 0	$ 300	$ 0
Impairment Of Long Lived Assets Held For Use After Tax			342
NextEra Energy Resources [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Planned capacity of Spain Solar projects - in megawatts			99.8
Carrying value of property, plant, and equipment prior to impairment charge	800		800
Property, Plant, and Equipment, Fair Value Disclosure	500		500
Impairment of Long-Lived Assets Held-for-use			300
Impairment Of Long Lived Assets Held For Use After Tax			$ 342