Commitments and Contingencies (Spain Solar Projects) (Details) € in Millions, $ in Millions	Sep. 30, 2016 USD ($)	Aug. 31, 2016 USD ($)	Aug. 31, 2016 EUR (€)
NextEra Energy Resources [Member]
Loss Contingencies [Line Items]
Amount of debt outstanding under financing agreements related to Spain solar projects	$ 537
Amount of noncurrent derivative liability classified as current derivative liability due to event of default	$ 155
Standby Letters of Credit [Member] | Capital Holdings [Member]
Loss Contingencies [Line Items]
Amount drawn on letters of credit		$ 26	€ 23