Income Taxes (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($) MW	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($) MW
Income Tax Contingency [Line Items]
Effective income tax rate (as a percent)	26.00%	29.00%	29.00%	28.00%
Production tax credits	$ 30	$ 31	$ 58	$ 73
Deferred income tax benefit associated with convertible investment tax credits	$ 42	43	$ 169	$ 79
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