Summarized Financial Information of NEECH (Cash Flow Statement) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 6,243	$ 5,231	[1]
Capital Expenditures Independent Power Investments And Nuclear Fuel Purchases	(13,613)	(9,257)
Capital contribution to Subsidiary	0	0
Sale of independent power and other investments of NEER	1,003	327	[1]
Proceeds from sale or maturity of securities in special use funds	2,812	2,579	[1]
Purchases of securities in special use funds	(2,901)	(2,860)	[1]
Distributions from equity method investees of independent power investments	0	637	[1]
Other - net	236	13	[1]
Net cash used in investing activities	(12,463)	(8,561)	[1]
Proceeds from Issuance of Long-term Debt	10,923	4,028	[1]
Retirements of long-term debt	(3,561)	(2,593)	[1]
Net change in commercial paper	(234)	773	[1]
Proceeds from other short-term debt	0	625	[1]
Repayments of other short-term debt	(4,725)	(450)	[1]
Payments from related parties under a cash sweep and credit support agreement – net	460	720	[1]
Proceeds from Issuance of Common Stock	1,488	714	[1]
Payments of Dividends	(1,797)	(1,570)	[1]
Cash Dividends Received from (Paid to) Parent Company	0	0
Other - net	(31)	(178)	[1]
Net cash provided by (used in) financing activities	2,523	2,069	[1]
Effects of currency translation on cash, cash equivalents and restricted cash	2	(1)	[1]
Net increase (decrease) in cash, cash equivalents and restricted cash	(3,695)	(1,262)	[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	1,558	721	[1]
Reportable Legal Entities [Member] | NextEra Energy (Guarantor) [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	2,774	2,839
Capital Expenditures Independent Power Investments And Nuclear Fuel Purchases	(202)	(124)
Capital contribution to Subsidiary	(2,219)	(1,798)
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	0	12
Net cash used in investing activities	(2,421)	(1,910)
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	1,488	714
Payments of Dividends	(1,797)	(1,570)
Cash Dividends Received from (Paid to) Parent Company	0	0
Other - net	(42)	(73)
Net cash provided by (used in) financing activities	(351)	(929)
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	1,564	1,578
Capital Expenditures Independent Power Investments And Nuclear Fuel Purchases	(4,725)	(5,536)
Capital contribution to Subsidiary	0	0
Sale of independent power and other investments of NEER	1,003	327
Proceeds from sale or maturity of securities in special use funds	1,014	955
Purchases of securities in special use funds	(1,017)	(1,074)
Distributions from equity method investees of independent power investments	0	637
Other - net	192	(203)
Net cash used in investing activities	(3,533)	(4,894)
Proceeds from Issuance of Long-term Debt	8,021	2,434
Retirements of long-term debt	(3,371)	(1,014)
Net change in commercial paper	422	2,255
Proceeds from other short-term debt	0	625
Repayments of other short-term debt	(4,725)	(200)
Payments from related parties under a cash sweep and credit support agreement – net	460	720
Proceeds from Issuance of Common Stock	0	0
Payments of Dividends	0	0
Cash Dividends Received from (Paid to) Parent Company	1,840	(2,727)
Other - net	51	(69)
Net cash provided by (used in) financing activities	2,698	2,024
Effects of currency translation on cash, cash equivalents and restricted cash	2	(1)
Net increase (decrease) in cash, cash equivalents and restricted cash	731	(1,293)
Cash, cash equivalents and restricted cash at beginning of period	533	1,807
Cash, cash equivalents and restricted cash at end of period	1,264	514
Consolidation, Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	1,905	814
Capital Expenditures Independent Power Investments And Nuclear Fuel Purchases	(8,686)	(3,597)
Capital contribution to Subsidiary	2,219	1,798
Sale of independent power and other investments of NEER	0	0
Proceeds from sale or maturity of securities in special use funds	1,798	1,624
Purchases of securities in special use funds	(1,884)	(1,786)
Distributions from equity method investees of independent power investments	0	0
Other - net	44	204
Net cash used in investing activities	(6,509)	(1,757)
Proceeds from Issuance of Long-term Debt	2,902	1,594
Retirements of long-term debt	(190)	(1,579)
Net change in commercial paper	(656)	(1,482)
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	(1,840)	2,727
Other - net	(40)	(36)
Net cash provided by (used in) financing activities	176	974
Effects of currency translation on cash, cash equivalents and restricted cash	0	0
Net increase (decrease) in cash, cash equivalents and restricted cash	(4,428)	31
Cash, cash equivalents and restricted cash at beginning of period	4,721	175
Cash, cash equivalents and restricted cash at end of period	$ 293	$ 206

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