Equity (Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss) before reclassifications	$ 11	$ 31	$ (43)	$ 6	$ 15	$ (35)
Amounts reclassified from AOCI	2	1	4	4	7	11
Total other comprehensive income, net of tax	13	32	(39)	10	22	(24)	$ 6	$ 8
Impact of disposal of a business			10
Acquisition of Gulf Power						(1)
Attributable to noncontrolling interests	(1)						(1)
Attributable to NEE	(152)						(152)		$ (169)
Ending balance	(153)			(181)			(153)	(181)
Net Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	1	(2)	(27)	(38)	(46)	(55)	(27)	(55)
Other comprehensive income (loss) before reclassifications	0	0	0	0	0	0
Amounts reclassified from AOCI	2	3	2	6	8	10
Total other comprehensive income, net of tax	2	3	2	6	8	10
Impact of disposal of a business			23
Acquisition of Gulf Power						(1)
Attributable to noncontrolling interests	0						0
Attributable to NEE	3						3
Ending balance	3	1	(2)	(32)	(38)	(46)	3	(32)
Net Unrealized Gains (Losses) on Available for Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	16	2	11	9	3	(7)	11	(7)
Other comprehensive income (loss) before reclassifications	3	14	(8)	4	7	8
Amounts reclassified from AOCI	(1)	0	(1)	(1)	(1)	2
Total other comprehensive income, net of tax	2	14	(9)	3	6	10
Impact of disposal of a business			0
Acquisition of Gulf Power						0
Attributable to noncontrolling interests	0						0
Attributable to NEE	18						18
Ending balance	18	16	2	12	9	3	18	12
Defined Benefit Pension and Other Benefits Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(113)	(111)	(114)	(119)	(118)	(65)	(114)	(65)
Other comprehensive income (loss) before reclassifications	0	0	0	0	(1)	(52)
Amounts reclassified from AOCI	1	(2)	3	(1)	0	(1)
Total other comprehensive income, net of tax	1	(2)	3	(1)	(1)	(53)
Impact of disposal of a business			0
Acquisition of Gulf Power						0
Attributable to noncontrolling interests	0						0
Attributable to NEE	(112)						(112)
Ending balance	(112)	(113)	(111)	(120)	(119)	(118)	(112)	(120)
Net Unrealized Gains (Losses) on Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(73)	(90)	(42)	(45)	(53)	(63)	(42)	(63)
Other comprehensive income (loss) before reclassifications	8	17	(35)	1	8	10
Amounts reclassified from AOCI	0	0	0	0	0	0
Total other comprehensive income, net of tax	8	17	(35)	1	8	10
Impact of disposal of a business			(13)
Acquisition of Gulf Power						0
Attributable to noncontrolling interests	(1)						(1)
Attributable to NEE	(64)						(64)
Ending balance	(65)	(73)	(90)	(44)	(45)	(53)	(65)	(44)
Other Comprehensive Income (Loss) Related to Equity Method Investees
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	3	3	3	2	1	2	3	2
Other comprehensive income (loss) before reclassifications	0	0	0	1	1	(1)
Amounts reclassified from AOCI	0	0	0	0	0	0
Total other comprehensive income, net of tax	0	0	0	1	1	(1)
Impact of disposal of a business			0
Acquisition of Gulf Power						0
Attributable to noncontrolling interests	0						0
Attributable to NEE	3						3
Ending balance	3	3	3	3	2	1	3	3
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(166)	(198)	(169)	(191)	(213)	(188)	$ (169)	$ (188)
Total other comprehensive income, net of tax	$ 11	29	(33)	$ 10	22	(24)
Ending balance		$ (166)	$ (198)		$ (191)	$ (213)