Summarized Financial Information of NEECH - Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	$ 87,013	$ 80,330	$ 73,639
Accumulated depreciation and amortization	(20,101)	(18,944)
Total property, plant and equipment - net	66,912	61,386
CURRENT ASSETS
Cash and cash equivalents	1,292	571	577	$ 438	$ 438
Receivables	2,439	2,265
Other	3,678	3,959
Total current assets	7,409	6,795
OTHER ASSETS
Investment in subsidiaries	0	0
Other	15,672	14,298
Total other assets	15,672	14,298
TOTAL ASSETS	89,993	82,479	74,605
CAPITALIZATION
Common shareholders' equity	24,341	22,574
Noncontrolling interests	990	538
Long-term debt	27,818	26,681
Total capitalization	53,149	49,793
CURRENT LIABILITIES
Debt due within one year	3,022	3,006
Accounts payable	3,447	2,529
Other	4,450	4,572
Total current liabilities	10,919	10,107
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	2,736	2,469
Deferred income taxes	11,101	9,827
Other	12,088	10,283
Total other liabilities and deferred credits	25,925	22,579
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	89,993	82,479
NEE (Guarantor) [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	28	27
Accumulated depreciation and amortization	(18)	(16)
Total property, plant and equipment - net	10	11
CURRENT ASSETS
Cash and cash equivalents	1	0	0	0
Receivables	88	90
Other	2	4
Total current assets	91	94
OTHER ASSETS
Investment in subsidiaries	24,323	22,544
Other	867	823
Total other assets	25,190	23,367
TOTAL ASSETS	25,291	23,472
CAPITALIZATION
Common shareholders' equity	24,341	22,574
Noncontrolling interests	0	0
Long-term debt	0	0
Total capitalization	24,341	22,574
CURRENT LIABILITIES
Debt due within one year	0	0
Accounts payable	1	4
Other	231	252
Total current liabilities	232	256
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	0	0
Deferred income taxes	82	157
Other	636	485
Total other liabilities and deferred credits	718	642
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	25,291	23,472
NEECH [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	38,671	34,921
Accumulated depreciation and amortization	(7,778)	(7,067)
Total property, plant and equipment - net	30,893	27,854
CURRENT ASSETS
Cash and cash equivalents	1,258	546	562	418
Receivables	1,615	1,510
Other	1,877	2,443
Total current assets	4,750	4,499
OTHER ASSETS
Investment in subsidiaries	0	0
Other	8,992	7,790
Total other assets	8,992	7,790
TOTAL ASSETS	44,635	40,143
CAPITALIZATION
Common shareholders' equity	7,699	6,990
Noncontrolling interests	990	538
Long-term debt	18,112	16,725
Total capitalization	26,801	24,253
CURRENT LIABILITIES
Debt due within one year	2,237	2,786
Accounts payable	2,668	1,919
Other	2,624	3,003
Total current liabilities	7,529	7,708
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	816	647
Deferred income taxes	3,002	2,396
Other	6,487	5,139
Total other liabilities and deferred credits	10,305	8,182
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	44,635	40,143
Other [Member]
PROPERTY, PLANT AND EQUIPMENT
Electric plant in service and other property	48,314	45,382
Accumulated depreciation and amortization	(12,305)	(11,861)
Total property, plant and equipment - net	36,009	33,521
CURRENT ASSETS
Cash and cash equivalents	33	25	$ 15	$ 20
Receivables	736	665
Other	1,799	1,512
Total current assets	2,568	2,202
OTHER ASSETS
Investment in subsidiaries	(24,323)	(22,544)
Other	5,813	5,685
Total other assets	(18,510)	(16,859)
TOTAL ASSETS	20,067	18,864
CAPITALIZATION
Common shareholders' equity	(7,699)	(6,990)
Noncontrolling interests	0	0
Long-term debt	9,706	9,956
Total capitalization	2,007	2,966
CURRENT LIABILITIES
Debt due within one year	785	220
Accounts payable	778	606
Other	1,595	1,317
Total current liabilities	3,158	2,143
OTHER LIABILITIES AND DEFERRED CREDITS
Asset retirement obligations	1,920	1,822
Deferred income taxes	8,017	7,274
Other	4,965	4,659
Total other liabilities and deferred credits	14,902	13,755
COMMITMENTS AND CONTINGENCIES
TOTAL CAPITALIZATION AND LIABILITIES	$ 20,067	$ 18,864