Summarized Financial Information of Capital Holdings (Statement of Cash Flows) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Condensed Consolidating Statements of Cash Flows
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 3,165	$ 3,270
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, independent power and other investments and nuclear fuel purchases	(6,937)	(6,066)
Proceeds from sale of the fiber-optic telecommunications business	1,482	0
Capital contributions from NEE	0	0
Sale of independent power and other investments of NEER	42	396
Proceeds from sale or maturity of securities in special use funds	1,419	1,609
Purchases of securities in special use funds	(1,531)	(1,654)
Proceeds from sales of noncontrolling interests in NEP	0	303
Other - net	16	(25)
Net cash used in investing activities	(5,509)	(5,437)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	2,771	2,509
Retirements of long-term debt	(1,885)	(996)
Proceeds from other short-term debt	200	500
Net change in commercial paper	1,847	1,008
Issuances of common stock - net	25	43
Dividends on common stock	(920)	(803)
Contributions from (dividends to) NEE	0	0
Other - net	(344)	65
Net cash provided by (used in) financing activities	1,694	2,326
Net increase (decrease) in cash and cash equivalents	(650)	159
Cash and cash equivalents at beginning of period	1,292	571
Cash and cash equivalents at end of period	642	730
Reportable Legal Entities [Member] | NextEra Energy (Guarantor) [Member]
Condensed Consolidating Statements of Cash Flows
NET CASH PROVIDED BY OPERATING ACTIVITIES	992	809
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, independent power and other investments and nuclear fuel purchases	0	0
Proceeds from sale of the fiber-optic telecommunications business	0	0
Capital contributions from NEE	(45)	(13)
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
Proceeds from sales of noncontrolling interests in NEP	0	0
Other - net	4	0
Net cash used in investing activities	(41)	(13)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	0	0
Retirements of long-term debt	0	0
Proceeds from other short-term debt	0	0
Net change in commercial paper	0	0
Issuances of common stock - net	25	43
Dividends on common stock	(920)	(803)
Contributions from (dividends to) NEE	0	0
Other - net	(56)	(36)
Net cash provided by (used in) financing activities	(951)	(796)
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	1	0
Cash and cash equivalents at end of period	1	0
Reportable Legal Entities [Member] | NEECH Non-Guarantor Subsidiaries [Member]
Condensed Consolidating Statements of Cash Flows
NET CASH PROVIDED BY OPERATING ACTIVITIES	1,200	1,084
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, independent power and other investments and nuclear fuel purchases	(4,195)	(3,866)
Proceeds from sale of the fiber-optic telecommunications business	1,482	0
Capital contributions from NEE	0	0
Sale of independent power and other investments of NEER	42	396
Proceeds from sale or maturity of securities in special use funds	518	530
Purchases of securities in special use funds	(582)	(534)
Proceeds from sales of noncontrolling interests in NEP	0	303
Other - net	(14)	(50)
Net cash used in investing activities	(2,749)	(3,221)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	2,572	2,509
Retirements of long-term debt	(1,850)	(963)
Proceeds from other short-term debt	0	0
Net change in commercial paper	1,115	701
Issuances of common stock - net	0	0
Dividends on common stock	0	0
Contributions from (dividends to) NEE	(637)	(33)
Other - net	(302)	91
Net cash provided by (used in) financing activities	898	2,305
Net increase (decrease) in cash and cash equivalents	(651)	168
Cash and cash equivalents at beginning of period	1,258	546
Cash and cash equivalents at end of period	607	714
Consolidation, Eliminations [Member]
Condensed Consolidating Statements of Cash Flows
NET CASH PROVIDED BY OPERATING ACTIVITIES	973	1,377
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, independent power and other investments and nuclear fuel purchases	(2,742)	(2,200)
Proceeds from sale of the fiber-optic telecommunications business	0	0
Capital contributions from NEE	45	13
Sale of independent power and other investments of NEER	0	0
Proceeds from sale or maturity of securities in special use funds	901	1,079
Purchases of securities in special use funds	(949)	(1,120)
Proceeds from sales of noncontrolling interests in NEP	0	0
Other - net	26	25
Net cash used in investing activities	(2,719)	(2,203)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	199	0
Retirements of long-term debt	(35)	(33)
Proceeds from other short-term debt	200	500
Net change in commercial paper	732	307
Issuances of common stock - net	0	0
Dividends on common stock	0	0
Contributions from (dividends to) NEE	637	33
Other - net	14	10
Net cash provided by (used in) financing activities	1,747	817
Net increase (decrease) in cash and cash equivalents	1	(9)
Cash and cash equivalents at beginning of period	33	25
Cash and cash equivalents at end of period	$ 34	$ 16