Summarized Financial Information of NEECH (Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
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	$ 88,115	$ 93,783
Accumulated depreciation and amortization	(20,919)	(21,367)
Total property, plant and equipment - net	67,196	72,416
CURRENT ASSETS
Cash and Cash Equivalents, at Carrying Value	550	1,714
Receivables	2,389	2,737
Other	2,673	2,706
Total current assets	5,612	7,157
OTHER ASSETS
Investments in Wholly-Owned Subsidiaries	0	0
Investment in equity method investees	6,774	2,321
Other	14,702	15,933
Total other assets	21,476	18,254
TOTAL ASSETS	94,284	97,827
CAPITALIZATION
Common shareholders' equity	32,706	28,208
Noncontrolling interests	3,287	1,290
Long-term debt	28,062	31,463
Total capitalization	64,055	60,961
CURRENT LIABILITIES
Debt due within one year	4,137	3,618
Accounts payable	1,748	3,235
Other	3,694	4,379
Total current liabilities	9,579	11,232
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	2,998	3,031
Deferred income taxes	7,007	5,754
Other	10,645	16,849
Total other liabilities and deferred credits	20,650	25,634
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	94,284	97,827
Reportable Legal Entities [Member] | NextEra Energy (Guarantor) [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	31	20
Accumulated depreciation and amortization	(26)	(15)
Total property, plant and equipment - net	5	5
CURRENT ASSETS
Cash and Cash Equivalents, at Carrying Value	3	1
Receivables	265	442
Other	5	5
Total current assets	273	448
OTHER ASSETS
Investments in Wholly-Owned Subsidiaries	32,417	27,825
Investment in equity method investees	0	0
Other	657	591
Total other assets	33,074	28,416
TOTAL ASSETS	33,352	28,869
CAPITALIZATION
Common shareholders' equity	32,706	28,208
Noncontrolling interests	0	0
Long-term debt	0	0
Total capitalization	32,706	28,208
CURRENT LIABILITIES
Debt due within one year	0	0
Accounts payable	1	3
Other	524	325
Total current liabilities	525	328
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	0	0
Deferred income taxes	(282)	(82)
Other	403	415
Total other liabilities and deferred credits	121	333
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	33,352	28,869
Reportable Legal Entities [Member] | NEECH Non-Guarantor Subsidiaries [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	35,292	41,782
Accumulated depreciation and amortization	(7,868)	(8,551)
Total property, plant and equipment - net	27,424	33,231
CURRENT ASSETS
Cash and Cash Equivalents, at Carrying Value	521	1,679
Receivables	1,488	1,633
Other	1,323	1,283
Total current assets	3,332	4,595
OTHER ASSETS
Investments in Wholly-Owned Subsidiaries		0
Investment in equity method investees	6,774	2,321
Other	6,131	7,620
Total other assets	12,905	9,941
TOTAL ASSETS	43,661	47,767
CAPITALIZATION
Common shareholders' equity	14,011	10,745
Noncontrolling interests	3,287	1,290
Long-term debt	16,259	20,227
Total capitalization	33,557	32,262
CURRENT LIABILITIES
Debt due within one year	2,484	1,215
Accounts payable	1,158	2,427
Other	1,745	2,073
Total current liabilities	5,387	5,715
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	927	984
Deferred income taxes	2,551	1,247
Other	1,239	7,559
Total other liabilities and deferred credits	4,717	9,790
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	43,661	47,767
Consolidation, Eliminations [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	52,792	51,981
Accumulated depreciation and amortization	(13,025)	(12,801)
Total property, plant and equipment - net	39,767	39,180
CURRENT ASSETS
Cash and Cash Equivalents, at Carrying Value	26	34
Receivables	636	662
Other	1,345	1,418
Total current assets	2,007	2,114
OTHER ASSETS
Investments in Wholly-Owned Subsidiaries	(32,417)	(27,825)
Investment in equity method investees	0	0
Other	7,914	7,722
Total other assets	(24,503)	(20,103)
TOTAL ASSETS	17,271	21,191
CAPITALIZATION
Common shareholders' equity	(14,011)	(10,745)
Noncontrolling interests	0	0
Long-term debt	11,803	11,236
Total capitalization	(2,208)	491
CURRENT LIABILITIES
Debt due within one year	1,653	2,403
Accounts payable	589	805
Other	1,425	1,981
Total current liabilities	3,667	5,189
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	2,071	2,047
Deferred income taxes	4,738	4,589
Other	9,003	8,875
Total other liabilities and deferred credits	15,812	15,511
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	$ 17,271	$ 21,191