Summarized Financial Information of NEECH - Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	$ 80,330	$ 73,639	$ 69,448
Accumulated depreciation and amortization	(18,944)	(17,934)
Total property, plant and equipment - net	61,386	55,705
CURRENT ASSETS
Cash and cash equivalents	571	577	438	$ 329	$ 329
Receivables	2,265	2,159
Other	3,959	4,208
Total current assets	6,795	6,944
OTHER ASSETS
Investment in subsidiaries	0	0
Total other assets	14,298	11,956
TOTAL ASSETS	82,479	74,605	69,007
CAPITALIZATION
Common shareholders' equity	22,574	19,916
Noncontrolling interests	538	252
Long-term debt	26,681	24,044
Total capitalization	49,793	44,212
CURRENT LIABILITIES
Debt due within one year	3,006	4,657
Accounts payable	2,529	1,354
Other	4,572	3,652
Total current liabilities	10,107	9,663
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	2,469	1,986
Deferred income taxes	9,827	9,261
Other	10,283	9,483
Total other liabilities and deferred credits	$ 22,579	$ 20,730
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	$ 82,479	$ 74,605
NEE (Guarantor) [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	27	27
Accumulated depreciation and amortization	(16)	(12)
Total property, plant and equipment - net	11	15
CURRENT ASSETS
Cash and cash equivalents	0	0	0	2
Receivables	90	82
Other	4	19
Total current assets	94	101
OTHER ASSETS
Investment in subsidiaries	22,544	19,703
Other	823	736
Total other assets	23,367	20,439
TOTAL ASSETS	23,472	20,555
CAPITALIZATION
Common shareholders' equity	22,574	19,916
Noncontrolling interests	0	0
Long-term debt	0	0
Total capitalization	22,574	19,916
CURRENT LIABILITIES
Debt due within one year	0	0
Accounts payable	4	29
Other	252	153
Total current liabilities	256	182
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	0	0
Deferred income taxes	157	149
Other	485	308
Total other liabilities and deferred credits	$ 642	$ 457
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	$ 23,472	$ 20,555
NEECH [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	34,921	31,674
Accumulated depreciation and amortization	(7,067)	(6,640)
Total property, plant and equipment - net	27,854	25,034
CURRENT ASSETS
Cash and cash equivalents	546	562	418	287
Receivables	1,510	1,378
Other	2,443	2,512
Total current assets	4,499	4,452
OTHER ASSETS
Investment in subsidiaries	0	0
Other	7,790	5,827
Total other assets	7,790	5,827
TOTAL ASSETS	40,143	35,313
CAPITALIZATION
Common shareholders' equity	6,990	6,553
Noncontrolling interests	538	252
Long-term debt	16,725	14,715
Total capitalization	24,253	21,520
CURRENT LIABILITIES
Debt due within one year	2,786	3,455
Accounts payable	1,919	739
Other	3,003	2,043
Total current liabilities	7,708	6,237
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	647	631
Deferred income taxes	2,396	2,608
Other	5,139	4,317
Total other liabilities and deferred credits	$ 8,182	$ 7,556
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	$ 40,143	$ 35,313
Other [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	45,382	41,938
Accumulated depreciation and amortization	(11,861)	(11,282)
Total property, plant and equipment - net	33,521	30,656
CURRENT ASSETS
Cash and cash equivalents	25	15	$ 20	$ 40
Receivables	665	699
Other	1,512	1,677
Total current assets	2,202	2,391
OTHER ASSETS
Investment in subsidiaries	(22,544)	(19,703)
Other	5,685	5,393
Total other assets	(16,859)	(14,310)
TOTAL ASSETS	18,864	18,737
CAPITALIZATION
Common shareholders' equity	(6,990)	(6,553)
Noncontrolling interests	0	0
Long-term debt	9,956	9,329
Total capitalization	2,966	2,776
CURRENT LIABILITIES
Debt due within one year	220	1,202
Accounts payable	606	586
Other	1,317	1,456
Total current liabilities	2,143	3,244
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	1,822	1,355
Deferred income taxes	7,274	6,504
Other	4,659	4,858
Total other liabilities and deferred credits	$ 13,755	$ 12,717
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	$ 18,864	$ 18,737