Summarized Financial Information of Capital Holdings (Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]
NEECH a 100% owned subsidiary of NEE	100.00%
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	$ 90,704	$ 87,013
Accumulated depreciation and amortization	(21,048)	(20,101)
Total property, plant and equipment - net	69,656	66,912
CURRENT ASSETS
Cash and cash equivalents	642	1,292	$ 730	$ 571
Receivables	2,480	2,439
Other	2,825	3,678
Total current assets	5,947	7,409
OTHER ASSETS
Investment in subsidiaries	0	0
Other	17,287	15,672
Total other assets	17,287	15,672
TOTAL ASSETS	92,890	89,993
CAPITALIZATION
Common shareholders' equity	25,926	24,341
Noncontrolling interests	950	990
Long-term debt	30,392	27,818
Total capitalization	57,268	53,149
CURRENT LIABILITIES
Debt due within one year	4,132	3,022
Accounts payable	1,814	3,447
Other	3,004	4,450
Total current liabilities	8,950	10,919
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	2,845	2,736
Deferred income taxes	12,102	11,101
Other	11,725	12,088
Total other liabilities and deferred credits	26,672	25,925
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	92,890	89,993
Reportable Legal Entities [Member] | NextEra Energy (Guarantor) [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	28	28
Accumulated depreciation and amortization	(19)	(18)
Total property, plant and equipment - net	9	10
CURRENT ASSETS
Cash and cash equivalents	1	1	0	0
Receivables	281	88
Other	3	2
Total current assets	285	91
OTHER ASSETS
Investment in subsidiaries	25,747	24,323
Other	834	867
Total other assets	26,581	25,190
TOTAL ASSETS	26,875	25,291
CAPITALIZATION
Common shareholders' equity	25,926	24,341
Noncontrolling interests	0	0
Long-term debt	0	0
Total capitalization	25,926	24,341
CURRENT LIABILITIES
Debt due within one year	0	0
Accounts payable	1	1
Other	306	231
Total current liabilities	307	232
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	0	0
Deferred income taxes	16	82
Other	626	636
Total other liabilities and deferred credits	642	718
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	26,875	25,291
Reportable Legal Entities [Member] | NEECH Non-Guarantor Subsidiaries [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	40,257	38,671
Accumulated depreciation and amortization	(8,342)	(7,778)
Total property, plant and equipment - net	31,915	30,893
CURRENT ASSETS
Cash and cash equivalents	607	1,258	714	546
Receivables	1,476	1,615
Other	1,323	1,877
Total current assets	3,406	4,750
OTHER ASSETS
Investment in subsidiaries	0	0
Other	9,869	8,992
Total other assets	9,869	8,992
TOTAL ASSETS	45,190	44,635
CAPITALIZATION
Common shareholders' equity	8,505	7,699
Noncontrolling interests	950	990
Long-term debt	20,304	18,112
Total capitalization	29,759	26,801
CURRENT LIABILITIES
Debt due within one year	2,420	2,237
Accounts payable	1,100	2,668
Other	1,214	2,624
Total current liabilities	4,734	7,529
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	868	816
Deferred income taxes	3,538	3,002
Other	6,291	6,487
Total other liabilities and deferred credits	10,697	10,305
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	45,190	44,635
Consolidation, Eliminations [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	50,419	48,314
Accumulated depreciation and amortization	(12,687)	(12,305)
Total property, plant and equipment - net	37,732	36,009
CURRENT ASSETS
Cash and cash equivalents	34	33	$ 16	$ 25
Receivables	723	736
Other	1,499	1,799
Total current assets	2,256	2,568
OTHER ASSETS
Investment in subsidiaries	(25,747)	(24,323)
Other	6,584	5,813
Total other assets	(19,163)	(18,510)
TOTAL ASSETS	20,825	20,067
CAPITALIZATION
Common shareholders' equity	(8,505)	(7,699)
Noncontrolling interests	0	0
Long-term debt	10,088	9,706
Total capitalization	1,583	2,007
CURRENT LIABILITIES
Debt due within one year	1,712	785
Accounts payable	713	778
Other	1,484	1,595
Total current liabilities	3,909	3,158
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	1,977	1,920
Deferred income taxes	8,548	8,017
Other	4,808	4,965
Total other liabilities and deferred credits	15,333	14,902
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	$ 20,825	$ 20,067