Investments in Partnerships and Joint Ventures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity method investment, financial statement, reported amounts [Abstract]
Ownership interest in partnerships and joint ventures	$ 2,321	$ 1,767
NextEra Energy Resources' ownership interest, low range (in hundredths)	31.00%
NextEra Energy Resources' ownership interest, high range (in hundredths)	50.00%
Equity method investment, summarized financial information [Abstract]
Net income	$ 358	264
Total assets	6,001	4,502
Total liabilities	1,217	1,364
Partners'/members' equity	4,784	3,138
NEER's investment carrying amount for the principal entities	2,321	1,767	$ 1,063
NEER [Member]
Equity method investment, summarized financial information [Abstract]
NEER's share of underlying equity in the principal entities	2,024	1,423
Difference between investment carrying amount and underlying equity in net assets	105	65
NEER's investment carrying amount for the principal entities	$ 2,129	$ 1,488