Summarized Financial Information of NEECH (Cash Flow Statement) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 3,281	$ 2,936	[1]
Capital Expenditures Independent Power Investments And Nuclear Fuel Purchases	(9,900)	(5,923)
Capital contribution to Subsidiary	0	0
Sale of independent power and other investments of NEER	995	311	[1]
Proceeds from sale or maturity of securities in special use funds	2,059	1,788	[1]
Purchases of securities in special use funds	(2,105)	(1,992)	[1]
Distributions from equity method investees of independent power investments	0	633	[1]
Other - net	60	(172)	[1]
Net cash used in investing activities	(8,891)	(5,355)	[1]
Proceeds from Issuance of Long-term Debt	7,554	2,875	[1]
Retirements of long-term debt	(1,876)	(1,214)	[1]
Net change in commercial paper	1,632	705	[1]
Proceeds from other short-term debt	0	200	[1]
Repayments of other short-term debt	(4,600)	(250)	[1]
Payments from related parties under a cash sweep and credit support agreement – net	671	50	[1]
Proceeds from Issuance of Common Stock	26	11	[1]
Payments of Dividends	(1,197)	(1,047)	[1]
Cash Dividends Received from (Paid to) Parent Company	0	0
Other - net	(158)	(143)	[1]
Net cash provided by (used in) financing activities	2,052	1,187	[1]
Effects of currency translation on cash, cash equivalents and restricted cash	8	(15)	[1]
Net increase (decrease) in cash, cash equivalents and restricted cash	(3,550)	(1,247)	[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	1,703	736	[1]
Reportable Legal Entities [Member] | NextEra Energy (Guarantor) [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	1,737	2,005
Capital Expenditures Independent Power Investments And Nuclear Fuel Purchases	(153)	(71)
Capital contribution to Subsidiary	(386)	(854)
Sale of independent power and other investments of NEER	0	0
Proceeds from sale or maturity of securities in special use funds	0	0
Purchases of securities in special use funds	0	0
Distributions from equity method investees of independent power investments	0	0
Other - net	18	12
Net cash used in investing activities	(521)	(913)
Proceeds from Issuance of Long-term Debt	0	0
Retirements of long-term debt	0	0
Net change in commercial paper	0	0
Proceeds from other short-term debt	0	0
Repayments of other short-term debt	0	0
Payments from related parties under a cash sweep and credit support agreement – net	0	0
Proceeds from Issuance of Common Stock	26	11
Payments of Dividends	(1,197)	(1,047)
Cash Dividends Received from (Paid to) Parent Company	0	0
Other - net	(43)	(56)
Net cash provided by (used in) financing activities	(1,214)	(1,092)
Effects of currency translation on cash, cash equivalents and restricted cash	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash	2	0
Cash, cash equivalents and restricted cash at beginning of period	(1)	1
Cash, cash equivalents and restricted cash at end of period	1	1
Reportable Legal Entities [Member] | NEECH Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	558	1,459
Capital Expenditures Independent Power Investments And Nuclear Fuel Purchases	(2,637)	(3,348)
Capital contribution to Subsidiary	0	0
Sale of independent power and other investments of NEER	995	311
Proceeds from sale or maturity of securities in special use funds	783	687
Purchases of securities in special use funds	(772)	(764)
Distributions from equity method investees of independent power investments	0	633
Other - net	18	(206)
Net cash used in investing activities	(1,613)	(2,687)
Proceeds from Issuance of Long-term Debt	5,751	1,281
Retirements of long-term debt	(1,722)	(415)
Net change in commercial paper	2,013	1,405
Proceeds from other short-term debt	0	200
Repayments of other short-term debt	(4,600)	0
Payments from related parties under a cash sweep and credit support agreement – net	671	50
Proceeds from Issuance of Common Stock	0	0
Payments of Dividends	0	0
Cash Dividends Received from (Paid to) Parent Company	(80)	(2,408)
Other - net	(93)	(56)
Net cash provided by (used in) financing activities	1,940	57
Effects of currency translation on cash, cash equivalents and restricted cash	8	(15)
Net increase (decrease) in cash, cash equivalents and restricted cash	893	(1,186)
Cash, cash equivalents and restricted cash at beginning of period	533	1,807
Cash, cash equivalents and restricted cash at end of period	1,426	621
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	986	(528)
Capital Expenditures Independent Power Investments And Nuclear Fuel Purchases	(7,110)	(2,504)
Capital contribution to Subsidiary	386	854
Sale of independent power and other investments of NEER	0	0
Proceeds from sale or maturity of securities in special use funds	1,276	1,101
Purchases of securities in special use funds	(1,333)	(1,228)
Distributions from equity method investees of independent power investments	0	0
Other - net	24	22
Net cash used in investing activities	(6,757)	(1,755)
Proceeds from Issuance of Long-term Debt	1,803	1,594
Retirements of long-term debt	(154)	(799)
Net change in commercial paper	(381)	(700)
Proceeds from other short-term debt	0	0
Repayments of other short-term debt	0	(250)
Payments from related parties under a cash sweep and credit support agreement – net	0	0
Proceeds from Issuance of Common Stock	0	0
Payments of Dividends	0	0
Cash Dividends Received from (Paid to) Parent Company	80	2,408
Other - net	(22)	(31)
Net cash provided by (used in) financing activities	1,326	2,222
Effects of currency translation on cash, cash equivalents and restricted cash	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash	(4,445)	(61)
Cash, cash equivalents and restricted cash at beginning of period	4,721	175
Cash, cash equivalents and restricted cash at end of period	$ 276	$ 114

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