CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
NET INCOME	$ 856	$ 789	$ 3,252	$ 1,988
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX
Reclassification of unrealized losses on cash flow hedges from accumulated other comprehensive income (loss) to net income (net of $4, $3, $9 and $26 tax expense, respectively)	10	17	24	53
Net unrealized gains (losses) on available for sale securities:
Net unrealized gains on securities still held (net of $23, $23, $68 and $42 tax expense, respectively)	31	31	91	56
Reclassification from accumulated other comprehensive income (loss) to net income (net of $4, $2, $15 and $6 tax benefit, respectively)	(6)	(2)	(23)	(8)
Defined benefit pension and other benefits plans (net of less than $1 tax benefit, $4 tax expense and $4 tax benefit, respectively)	(1)	0	6	(7)
Net unrealized gains (losses) on foreign currency translation (net of less than $1, $1 and $1 tax expense and $2 tax benefit, respectively)	10	(9)	30	19
Other comprehensive income (loss) related to equity method investee (net of less than $1 tax expense, $0, less than $1 tax expense and $3 tax benefit, respectively)	1	3	1	(1)
Total other comprehensive income, net of tax	45	40	129	112
COMPREHENSIVE INCOME	901	829	3,381	2,100
LESS COMPREHENSIVE INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	9	30	40	22
COMPREHENSIVE INCOME ATTRIBUTABLE TO NEE	$ 892	$ 799	$ 3,341	$ 2,078