Equity (Earnings Per Share) (Details) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 14, 2020 shares	Oct. 23, 2020 USD ($)	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2019 shares
Reconciliation of basic and diluted earnings per share of common stock [Abstract]
Net income attributable to NEE - basic | $			$ 1,229	$ 879	$ 2,924	$ 2,794
Dilutive Securities, Effect on Basic Earnings Per Share | $			(1)	0	0	0
Net income attributable to NEE - assuming dilution | $			$ 1,228	$ 879	$ 2,924	$ 2,794
Denominator:
Weighted-average number of common shares outstanding - basic | shares			489,900,000	481,900,000	489,600,000	479,700,000
Equity units, stock options, performance share awards and restricted stock | shares			2,300,000	4,100,000	2,300,000	3,800,000
Weighted-average number of common shares outstanding - assuming dilution | shares			492,200,000	486,000,000.0	491,900,000	483,500,000
Earnings per share attributable to NEE:
Basic (in dollars per share) | $ / shares			$ 2.51	$ 1.82	$ 5.97	$ 5.82
Assuming dilution (in dollars per share) | $ / shares			$ 2.50	$ 1.81	$ 5.94	$ 5.78
Class of Stock [Line Items]
Antidilutive securities (in shares) | shares			11,500,000	2,200,000	9,000,000.0	1,000,000.0
Stock split, conversion ratio	4
Common stock, shares authorized (in shares) | shares	3,200,000,000		800,000,000		800,000,000		800,000,000
Pro forma earnings per share (USD pre share) | $ / shares			$ 0.62	$ 0.45	$ 1.49	$ 1.44
NextEra Energy Partners [Member] | Series A Convertible Preferred Units [Member]
Class of Stock [Line Items]
Amount of shares converted | $			$ 71	$ 183
NextEra Energy Partners [Member] | Series A Convertible Preferred Units [Member] | Subsequent Event [Member]
Class of Stock [Line Items]
Amount of shares converted | $		$ 46