Summarized Financial Information of NEECH - Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	$ 107,178	$ 92,083	$ 93,565
Accumulated depreciation and amortization	(25,168)	(21,749)	(21,276)
Total property, plant and equipment - net	82,010	70,334
CURRENT ASSETS
Cash and cash equivalents	600	638
Receivables	2,807	2,969
Other	4,001	2,786
Total current assets	7,408	6,393
OTHER ASSETS
Investment in subsidiaries	0	0
Investment in equity method investees	7,453	6,748	2,321
Goodwill	4,204	891
Other	16,616	19,336
Total other assets	28,273	26,975
TOTAL ASSETS	117,691	103,702	$ 97,963
CAPITALIZATION
Common shareholders' equity	37,005	34,144
Noncontrolling interests	4,355	3,269
Redeemable noncontrolling interests	487	468
Long-term debt	37,543	26,782
Total capitalization	79,390	64,663
CURRENT LIABILITIES
Debt due within one year	5,040	10,930
Accounts payable	3,631	2,386
Other	5,182	4,247
Total current liabilities	13,853	17,563
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	3,457	3,135
Deferred income taxes	8,361	7,367
Other	12,630	10,974
Total other liabilities and deferred credits	24,448	21,476
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	117,691	103,702
Reportable Legal Entities [Member] | NEE (Guarantor) [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	170	220
Accumulated depreciation and amortization	(111)	(58)
Total property, plant and equipment - net	59	162
CURRENT ASSETS
Cash and cash equivalents	1	(1)
Receivables	81	292
Other	16	5
Total current assets	98	296
OTHER ASSETS
Investment in subsidiaries	36,783	33,397
Investment in equity method investees	0	0
Goodwill	1	1
Other	404	937
Total other assets	37,188	34,335
TOTAL ASSETS	37,345	34,793
CAPITALIZATION
Common shareholders' equity	37,005	34,144
Noncontrolling interests	0	0
Redeemable noncontrolling interests	0	0
Long-term debt	0	0
Total capitalization	37,005	34,144
CURRENT LIABILITIES
Debt due within one year	0	0
Accounts payable	3	32
Other	167	168
Total current liabilities	170	200
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	0	0
Deferred income taxes	(410)	(157)
Other	580	606
Total other liabilities and deferred credits	170	449
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	37,345	34,793
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	41,585	37,145
Accumulated depreciation and amortization	(9,473)	(8,473)
Total property, plant and equipment - net	32,112	28,672
CURRENT ASSETS
Cash and cash equivalents	515	525
Receivables	1,489	1,771
Other	2,633	1,425
Total current assets	4,637	3,721
OTHER ASSETS
Investment in subsidiaries	0	0
Investment in equity method investees	7,453	6,748
Goodwill	1,217	587
Other	6,899	5,890
Total other assets	15,569	13,225
TOTAL ASSETS	52,318	45,618
CAPITALIZATION
Common shareholders' equity	11,050	7,917
Noncontrolling interests	4,355	3,269
Redeemable noncontrolling interests	487	468
Long-term debt	21,901	15,094
Total capitalization	37,793	26,748
CURRENT LIABILITIES
Debt due within one year	2,961	9,579
Accounts payable	2,755	1,730
Other	2,817	2,364
Total current liabilities	8,533	13,673
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	1,072	988
Deferred income taxes	2,956	2,778
Other	1,964	1,431
Total other liabilities and deferred credits	5,992	5,197
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	52,318	45,618
Consolidation, Eliminations [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	65,423	54,718
Accumulated depreciation and amortization	(15,584)	(13,218)
Total property, plant and equipment - net	49,839	41,500
CURRENT ASSETS
Cash and cash equivalents	84	114
Receivables	1,237	906
Other	1,352	1,356
Total current assets	2,673	2,376
OTHER ASSETS
Investment in subsidiaries	(36,783)	(33,397)
Investment in equity method investees	0	0
Goodwill	2,986	303
Other	9,313	12,509
Total other assets	(24,484)	(20,585)
TOTAL ASSETS	28,028	23,291
CAPITALIZATION
Common shareholders' equity	(11,050)	(7,917)
Noncontrolling interests	0	0
Redeemable noncontrolling interests	0	0
Long-term debt	15,642	11,688
Total capitalization	4,592	3,771
CURRENT LIABILITIES
Debt due within one year	2,079	1,351
Accounts payable	873	624
Other	2,198	1,715
Total current liabilities	5,150	3,690
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	2,385	2,147
Deferred income taxes	5,815	4,746
Other	10,086	8,937
Total other liabilities and deferred credits	18,286	15,830
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	$ 28,028	$ 23,291