Equity (Earnings Per Share) (Details) $ / shares in Units, $ in Millions		3 Months Ended
	Sep. 14, 2020 shares	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2020 shares	Oct. 26, 2020 shares
Reconciliation of basic and diluted earnings per share of common stock [Abstract]
Numerator - net income attributable to NEE(a) | $		$ 1,666	$ 421
Denominator:
Weighted-average number of common shares outstanding - basic		1,961,600,000	1,957,000,000.0
Equity units, stock options, performance share awards and restricted stock		11,400,000	10,000,000.0
Weighted-average number of common shares outstanding - assuming dilution		1,973,000,000.0	1,967,000,000.0
Earnings per share attributable to NEE:
Basic (in dollars per share) | $ / shares		$ 0.85	$ 0.21
Assuming dilution (in dollars per share) | $ / shares		$ 0.84	$ 0.21
Class of Stock [Line Items]
Antidilutive securities (in shares)		58,400,000	24,700,000
Stock split, conversion ratio	4
Common stock, shares authorized (in shares)	800,000,000	3,200,000,000		3,200,000,000	3,200,000,000