Income Taxes (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) MW	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) MW	Sep. 30, 2015 USD ($)
Income Tax Contingency [Line Items]
Effective income tax rate (as a percent)	35.00%	32.00%	31.00%	30.00%
Production tax credits	$ 19	$ 29	$ 92	$ 105
Deferred income tax benefit associated with convertible investment tax credits	$ 34	$ 16	115	$ 67
Income tax benefits associated with the reorganization of certain Canadian assets			30
NextEra Energy Resources subsidiary [Member] | Merchant Natural Gas Generation Facilities [Member]
Income Tax Contingency [Line Items]
Income tax charge associated with the sale of ownership interest			$ 58
Total generating capacity | MW	2,884		2,884