Summarized Financial Information of NEECH (Balance Sheet) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	$ 90,325	$ 93,783
Accumulated depreciation and amortization	(21,753)	(21,367)
Total property, plant and equipment - net	68,572	72,416
CURRENT ASSETS
Cash and Cash Equivalents, at Carrying Value	497	1,714
Receivables	3,119	2,737
Other	4,733	2,706
Total current assets	8,349	7,157
OTHER ASSETS
Investments in Wholly-Owned Subsidiaries	0	0
Investment in equity method investees	6,493	2,321
Other	15,189	15,933
Total other assets	21,682	18,254
TOTAL ASSETS	98,603	97,827
CAPITALIZATION
Common shareholders' equity	34,252	28,208
Noncontrolling interests	3,086	1,290
Long-term debt	27,048	31,463
Total capitalization	64,386	60,961
CURRENT LIABILITIES
Debt due within one year	5,539	3,618
Accounts payable	3,000	3,235
Other	4,268	4,379
Total current liabilities	12,807	11,232
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	3,065	3,031
Deferred income taxes	7,420	5,754
Other	10,925	16,849
Total other liabilities and deferred credits	21,410	25,634
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	98,603	97,827
Reportable Legal Entities [Member] | NextEra Energy (Guarantor) [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	199	20
Accumulated depreciation and amortization	(49)	(15)
Total property, plant and equipment - net	150	5
CURRENT ASSETS
Cash and Cash Equivalents, at Carrying Value	1	1
Receivables	474	442
Other	5	5
Total current assets	480	448
OTHER ASSETS
Investments in Wholly-Owned Subsidiaries	33,569	27,825
Investment in equity method investees	0	0
Other	666	591
Total other assets	34,235	28,416
TOTAL ASSETS	34,865	28,869
CAPITALIZATION
Common shareholders' equity	34,252	28,208
Noncontrolling interests	0	0
Long-term debt	0	0
Total capitalization	34,252	28,208
CURRENT LIABILITIES
Debt due within one year	0	0
Accounts payable	27	3
Other	322	325
Total current liabilities	349	328
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	0	0
Deferred income taxes	(100)	(82)
Other	364	415
Total other liabilities and deferred credits	264	333
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	34,865	28,869
Reportable Legal Entities [Member] | NEECH Non-Guarantor Subsidiaries [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	35,648	41,782
Accumulated depreciation and amortization	(8,378)	(8,551)
Total property, plant and equipment - net	27,270	33,231
CURRENT ASSETS
Cash and Cash Equivalents, at Carrying Value	391	1,679
Receivables	1,660	1,633
Other	3,402	1,283
Total current assets	5,453	4,595
OTHER ASSETS
Investments in Wholly-Owned Subsidiaries	0	0
Investment in equity method investees	6,493	2,321
Other	6,339	7,620
Total other assets	12,832	9,941
TOTAL ASSETS	45,555	47,767
CAPITALIZATION
Common shareholders' equity	12,453	10,745
Noncontrolling interests	3,086	1,290
Long-term debt	15,453	20,227
Total capitalization	30,992	32,262
CURRENT LIABILITIES
Debt due within one year	5,239	1,215
Accounts payable	2,302	2,427
Other	2,043	2,073
Total current liabilities	9,584	5,715
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	943	984
Deferred income taxes	2,757	1,247
Other	1,279	7,559
Total other liabilities and deferred credits	4,979	9,790
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	45,555	47,767
Consolidation, Eliminations [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	54,478	51,981
Accumulated depreciation and amortization	(13,326)	(12,801)
Total property, plant and equipment - net	41,152	39,180
CURRENT ASSETS
Cash and Cash Equivalents, at Carrying Value	105	34
Receivables	985	662
Other	1,326	1,418
Total current assets	2,416	2,114
OTHER ASSETS
Investments in Wholly-Owned Subsidiaries	(33,569)	(27,825)
Investment in equity method investees	0	0
Other	8,184	7,722
Total other assets	(25,385)	(20,103)
TOTAL ASSETS	18,183	21,191
CAPITALIZATION
Common shareholders' equity	(12,453)	(10,745)
Noncontrolling interests	0	0
Long-term debt	11,595	11,236
Total capitalization	(858)	491
CURRENT LIABILITIES
Debt due within one year	300	2,403
Accounts payable	671	805
Other	1,903	1,981
Total current liabilities	2,874	5,189
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	2,122	2,047
Deferred income taxes	4,763	4,589
Other	9,282	8,875
Total other liabilities and deferred credits	16,167	15,511
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	$ 18,183	$ 21,191