Summarized Financial Information of NEECH (Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	$ 89,751	$ 93,783
Accumulated depreciation and amortization	(21,092)	(21,367)
Total property, plant and equipment - net	68,659	72,416
CURRENT ASSETS
Cash and Cash Equivalents, at Carrying Value	478	1,714
Receivables	2,891	2,737
Other	2,516	2,706
Total current assets	5,885	7,157
OTHER ASSETS
Investments in Wholly-Owned Subsidiaries	0	0
Investment in equity method investees	6,217	2,321
Other	14,729	15,933
Total other assets	20,946	18,254
TOTAL ASSETS	95,490	97,827
CAPITALIZATION
Common shareholders' equity	33,021	28,208
Noncontrolling interests	3,151	1,290
Long-term debt	28,356	31,463
Total capitalization	64,528	60,961
CURRENT LIABILITIES
Debt due within one year	4,210	3,618
Accounts payable	2,298	3,235
Other	3,676	4,379
Total current liabilities	10,184	11,232
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	3,048	3,031
Deferred income taxes	7,162	5,754
Other	10,568	16,849
Total other liabilities and deferred credits	20,778	25,634
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	95,490	97,827
Reportable Legal Entities [Member] | NextEra Energy (Guarantor) [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	112	20
Accumulated depreciation and amortization	(37)	(15)
Total property, plant and equipment - net	75	5
CURRENT ASSETS
Cash and Cash Equivalents, at Carrying Value	1	1
Receivables	619	442
Other	5	5
Total current assets	625	448
OTHER ASSETS
Investments in Wholly-Owned Subsidiaries	32,078	27,825
Investment in equity method investees	0	0
Other	654	591
Total other assets	32,732	28,416
TOTAL ASSETS	33,432	28,869
CAPITALIZATION
Common shareholders' equity	33,090	28,208
Noncontrolling interests	0	0
Long-term debt	0	0
Total capitalization	33,090	28,208
CURRENT LIABILITIES
Debt due within one year	0	0
Accounts payable	2	3
Other	200	325
Total current liabilities	202	328
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	0	0
Deferred income taxes	(239)	(82)
Other	379	415
Total other liabilities and deferred credits	140	333
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	33,432	28,869
Reportable Legal Entities [Member] | NEECH Non-Guarantor Subsidiaries [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	36,332	41,782
Accumulated depreciation and amortization	(8,169)	(8,551)
Total property, plant and equipment - net	28,163	33,231
CURRENT ASSETS
Cash and Cash Equivalents, at Carrying Value	437	1,679
Receivables	1,608	1,633
Other	1,214	1,283
Total current assets	3,259	4,595
OTHER ASSETS
Investments in Wholly-Owned Subsidiaries	0	0
Investment in equity method investees	6,217	2,321
Other	6,206	7,620
Total other assets	12,423	9,941
TOTAL ASSETS	43,845	47,767
CAPITALIZATION
Common shareholders' equity	12,984	10,745
Noncontrolling interests	3,151	1,290
Long-term debt	15,977	20,227
Total capitalization	32,112	32,262
CURRENT LIABILITIES
Debt due within one year	3,131	1,215
Accounts payable	1,675	2,427
Other	2,089	2,073
Total current liabilities	6,895	5,715
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	951	984
Deferred income taxes	2,646	1,247
Other	1,241	7,559
Total other liabilities and deferred credits	4,838	9,790
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	43,845	47,767
Consolidation, Eliminations [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	53,307	51,981
Accumulated depreciation and amortization	(12,886)	(12,801)
Total property, plant and equipment - net	40,421	39,180
CURRENT ASSETS
Cash and Cash Equivalents, at Carrying Value	40	34
Receivables	664	662
Other	1,297	1,418
Total current assets	2,001	2,114
OTHER ASSETS
Investments in Wholly-Owned Subsidiaries	(32,078)	(27,825)
Investment in equity method investees	0	0
Other	7,869	7,722
Total other assets	(24,209)	(20,103)
TOTAL ASSETS	18,213	21,191
CAPITALIZATION
Common shareholders' equity	(13,053)	(10,745)
Noncontrolling interests	0	0
Long-term debt	12,379	11,236
Total capitalization	(674)	491
CURRENT LIABILITIES
Debt due within one year	1,079	2,403
Accounts payable	621	805
Other	1,387	1,981
Total current liabilities	3,087	5,189
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	2,097	2,047
Deferred income taxes	4,755	4,589
Other	8,948	8,875
Total other liabilities and deferred credits	15,800	15,511
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	$ 18,213	$ 21,191