Summarized Financial Information of NEECH (Cash Flow Statement) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 1,597	$ 1,291	[1]
Capital Expenditures Independent Power Investments And Nuclear Fuel Purchases	(7,029)	(3,588)
Capital contribution to Subsidiary	0	0
Proceeds from sale or maturity of securities in special use funds	966	919	[1]
Purchases of securities in special use funds	(1,019)	(1,039)	[1]
Other - net	137	41	[1]
Net cash used in investing activities	(6,945)	(3,667)	[1]
Proceeds from Issuance of Long-term Debt	2,768	1,804	[1]
Retirements of long-term debt	(166)	(942)	[1]
Net change in commercial paper	(448)	1,277	[1]
Repayments of other short-term debt	(50)	(250)	[1]
Payments to related parties under a cash sweep and credit support agreement – net	(24)	2	[1]
Proceeds from Issuance of Common Stock	20	7	[1]
Payments of Dividends	(598)	(523)	[1]
Cash Dividends Received from (Paid to) Parent Company	0	0
Other - net	(75)	(65)	[1]
Net cash provided by (used in) financing activities	1,427	1,310	[1]
Effects of currency translation on cash, cash equivalents and restricted cash	9	(9)	[1]
Net decrease in cash, cash equivalents and restricted cash	(3,912)	(1,075)	[1]
Cash, cash equivalents and restricted cash at beginning of period	5,253	1,983	[1]
Cash, cash equivalents and restricted cash at end of period	1,341	908	[1]
Reportable Legal Entities [Member] | NextEra Energy (Guarantor) [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	979	1,391
Capital Expenditures Independent Power Investments And Nuclear Fuel Purchases	(108)	0
Capital contribution to Subsidiary	(276)	(853)
Proceeds from sale or maturity of securities in special use funds	0	0
Purchases of securities in special use funds	0	0
Other - net	12	12
Net cash used in investing activities	(372)	(841)
Proceeds from Issuance of Long-term Debt	0	0
Retirements of long-term debt	0	0
Net change in commercial paper	0	0
Repayments of other short-term debt	0	0
Payments to related parties under a cash sweep and credit support agreement – net	0	0
Proceeds from Issuance of Common Stock	20	7
Payments of Dividends	(598)	(523)
Cash Dividends Received from (Paid to) Parent Company	0	0
Other - net	(27)	(32)
Net cash provided by (used in) financing activities	(605)	(548)
Effects of currency translation on cash, cash equivalents and restricted cash	0	0
Net decrease in cash, cash equivalents and restricted cash	2	2
Cash, cash equivalents and restricted cash at beginning of period	(1)	1
Cash, cash equivalents and restricted cash at end of period	1	3
Reportable Legal Entities [Member] | NEECH Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	353	503
Capital Expenditures Independent Power Investments And Nuclear Fuel Purchases	(1,224)	(2,385)
Capital contribution to Subsidiary	0	0
Proceeds from sale or maturity of securities in special use funds	404	489
Purchases of securities in special use funds	(423)	(506)
Other - net	104	11
Net cash used in investing activities	(1,139)	(2,391)
Proceeds from Issuance of Long-term Debt	2,051	804
Retirements of long-term debt	(127)	(155)
Net change in commercial paper	412	1,403
Repayments of other short-term debt	(50)	0
Payments to related parties under a cash sweep and credit support agreement – net	(24)	0
Proceeds from Issuance of Common Stock	0	0
Payments of Dividends	0	0
Cash Dividends Received from (Paid to) Parent Company	(895)	(1,191)
Other - net	(38)	(9)
Net cash provided by (used in) financing activities	1,329	852
Effects of currency translation on cash, cash equivalents and restricted cash	9	(9)
Net decrease in cash, cash equivalents and restricted cash	552	(1,045)
Cash, cash equivalents and restricted cash at beginning of period	533	1,807
Cash, cash equivalents and restricted cash at end of period	1,085	762
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	265	(603)
Capital Expenditures Independent Power Investments And Nuclear Fuel Purchases	(5,697)	(1,203)
Capital contribution to Subsidiary	276	853
Proceeds from sale or maturity of securities in special use funds	562	430
Purchases of securities in special use funds	(596)	(533)
Other - net	21	18
Net cash used in investing activities	(5,434)	(435)
Proceeds from Issuance of Long-term Debt	717	1,000
Retirements of long-term debt	(39)	(787)
Net change in commercial paper	(860)	(126)
Repayments of other short-term debt	0	(250)
Payments to related parties under a cash sweep and credit support agreement – net	0	2
Proceeds from Issuance of Common Stock	0	0
Payments of Dividends	0	0
Cash Dividends Received from (Paid to) Parent Company	895	1,191
Other - net	(10)	(24)
Net cash provided by (used in) financing activities	703	1,006
Effects of currency translation on cash, cash equivalents and restricted cash	0	0
Net decrease in cash, cash equivalents and restricted cash	(4,466)	(32)
Cash, cash equivalents and restricted cash at beginning of period	4,721	175
Cash, cash equivalents and restricted cash at end of period	$ 255	$ 143

[1] Amounts have been retrospectively adjusted for an accounting standards update related to leases.