Summarized Financial Information of NEECH - Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	$ 92,083	$ 93,565		$ 86,798
Accumulated depreciation and amortization	(21,749)	(21,276)	[1]	(20,018)
Total property, plant and equipment - net	70,334	72,289	[1]
CURRENT ASSETS
Cash and cash equivalents	638	1,714	[1]
Receivables	2,969	2,737
Other	2,786	2,730
Total current assets	6,393	7,181	[1]
OTHER ASSETS
Investment in subsidiaries	0	0
Investment in equity method investees	6,748	2,321	[1]	1,767
Other	20,227	16,172
Total other assets	26,975	18,493	[1]
TOTAL ASSETS	103,702	97,963	[1]	$ 90,474
CAPITALIZATION
Common shareholders' equity	34,144	28,236	[1]
Noncontrolling interests	3,269	1,295	[1]
Redeemable noncontrolling interests	468	0	[1]
Long-term debt	26,782	31,410	[1]
Total capitalization	64,663	60,941	[1]
CURRENT LIABILITIES
Debt due within one year	10,930	3,615
Accounts payable	2,386	3,235	[1]
Other	4,247	4,393
Total current liabilities	17,563	11,243	[1]
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	3,135	3,031	[1]
Deferred income taxes	7,367	5,764	[1]
Other	10,974	16,984
Total other liabilities and deferred credits	21,476	25,779	[1]
COMMITMENTS AND CONTINGENCIES			[1]
TOTAL CAPITALIZATION AND LIABILITIES	103,702	97,963	[1]
Reportable Legal Entities [Member] | NEE (Guarantor) [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	220	20
Accumulated depreciation and amortization	(58)	(15)
Total property, plant and equipment - net	162	5
CURRENT ASSETS
Cash and cash equivalents	(1)	1
Receivables	292	442
Other	5	5
Total current assets	296	448
OTHER ASSETS
Investment in subsidiaries	33,397	27,853
Investment in equity method investees	0	0
Other	938	595
Total other assets	34,335	28,448
TOTAL ASSETS	34,793	28,901
CAPITALIZATION
Common shareholders' equity	34,144	28,236
Noncontrolling interests	0	0
Redeemable noncontrolling interests	0	0
Long-term debt	0	0
Total capitalization	34,144	28,236
CURRENT LIABILITIES
Debt due within one year	0	0
Accounts payable	32	3
Other	168	325
Total current liabilities	200	328
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	0	0
Deferred income taxes	(157)	(82)
Other	606	419
Total other liabilities and deferred credits	449	337
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	34,793	28,901
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	37,145	41,630
Accumulated depreciation and amortization	(8,473)	(8,470)
Total property, plant and equipment - net	28,672	33,160
CURRENT ASSETS
Cash and cash equivalents	525	1,679
Receivables	1,771	1,633
Other	1,425	1,307
Total current assets	3,721	4,619
OTHER ASSETS
Investment in subsidiaries	0	0
Investment in equity method investees	6,748	2,321
Other	6,477	7,789
Total other assets	13,225	10,110
TOTAL ASSETS	45,618	47,889
CAPITALIZATION
Common shareholders' equity	7,917	10,773
Noncontrolling interests	3,269	1,295
Redeemable noncontrolling interests	468	0
Long-term debt	15,094	20,224
Total capitalization	26,748	32,292
CURRENT LIABILITIES
Debt due within one year	9,579	1,213
Accounts payable	1,730	2,427
Other	2,364	2,081
Total current liabilities	13,673	5,721
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	988	984
Deferred income taxes	2,778	1,257
Other	1,431	7,635
Total other liabilities and deferred credits	5,197	9,876
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	45,618	47,889
Consolidation, Eliminations [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	54,718	51,915
Accumulated depreciation and amortization	(13,218)	(12,791)
Total property, plant and equipment - net	41,500	39,124
CURRENT ASSETS
Cash and cash equivalents	114	34
Receivables	906	662
Other	1,356	1,418
Total current assets	2,376	2,114
OTHER ASSETS
Investment in subsidiaries	(33,397)	(27,853)
Investment in equity method investees	0	0
Other	12,812	7,788
Total other assets	(20,585)	(20,065)
TOTAL ASSETS	23,291	21,173
CAPITALIZATION
Common shareholders' equity	(7,917)	(10,773)
Noncontrolling interests	0	0
Redeemable noncontrolling interests	0	0
Long-term debt	11,688	11,186
Total capitalization	3,771	413
CURRENT LIABILITIES
Debt due within one year	1,351	2,402
Accounts payable	624	805
Other	1,715	1,987
Total current liabilities	3,690	5,194
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	2,147	2,047
Deferred income taxes	4,746	4,589
Other	8,937	8,930
Total other liabilities and deferred credits	15,830	15,566
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	$ 23,291	$ 21,173

[1] Amounts have been retrospectively adjusted as discussed in Note 14.