Income Taxes (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($) MW	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($) MW
Income Tax Contingency [Line Items]
Effective income tax rate (as a percent)	30.00%	35.00%	29.00%	31.00%
Production tax credits	$ 27	$ 19	$ 85	$ 92
Deferred income tax benefit associated with convertible investment tax credits	$ 51	34	$ 220	$ 115
Production tax credit (PTC), roll off period			10 years
Reorganization Value, Income Tax Benefits Associated with Reorganization of Certain Assets		30
Merchant Natural Gas Generation Facilities [Member] | NextEra Energy Resources subsidiary [Member]
Income Tax Contingency [Line Items]
Income Tax Charge Related to Sale of Asset		$ 58
Renewable Energy Assets, Power Generation Capacity | MW		2,884		2,884