Summarized Financial Information of Capital Holdings (Statement of Cash Flows) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Condensed Consolidating Statements of Cash Flows
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 5,294	$ 4,513
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, independent power and other investments and nuclear fuel purchases	(7,929)	(5,676)
Capital contributions from NEE	0	0
Sale of independent power and other investments of NEER	395	34
Proceeds from sale of a noncontrolling interest in subsidiaries	645	319
Other - net	(94)	(154)
Net cash used in investing activities	(6,983)	(5,477)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	4,644	3,462
Retirements of long-term debt	(2,654)	(3,097)
Proceeds from differential membership investors	328	46
Payments To Differential Membership Investors	(84)	(68)
Proceeds from notes payable	500	1,450
Repayments of notes payable	(362)	(313)
Net change in commercial paper	254	(116)
Issuances of common stock	528	1,274
Dividends on common stock	(1,205)	(1,031)
Contributions from (dividends to) NEE	0	0
Other - net	(150)	(39)
Other - net (NEE consolidated)	(150)	(39)
Net cash provided by (used in) financing activities	1,799	1,568
Net increase in cash and cash equivalents	110	604
Cash and cash equivalents at beginning of period	571	577
Cash and cash equivalents at end of period	681	1,181
NextEra Energy (Guarantor) [Member]
Condensed Consolidating Statements of Cash Flows
NET CASH PROVIDED BY OPERATING ACTIVITIES	1,164	1,242
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, independent power and other investments and nuclear fuel purchases	(1)	0
Capital contributions from NEE	(432)	(1,454)
Sale of independent power and other investments of NEER	0	0
Proceeds from sale of a noncontrolling interest in subsidiaries	0	0
Other - net	0	(17)
Net cash used in investing activities	(433)	(1,471)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	0	0
Retirements of long-term debt	0	0
Proceeds from differential membership investors	0	0
Payments To Differential Membership Investors	0	0
Proceeds from notes payable	0	0
Repayments of notes payable	0	0
Net change in commercial paper	0	0
Issuances of common stock	528	1,274
Dividends on common stock	(1,205)	(1,031)
Contributions from (dividends to) NEE	0	0
Other - net	(54)	(14)
Net cash provided by (used in) financing activities	(731)	229
Net increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Capital Holdings Consolidated [Member]
Condensed Consolidating Statements of Cash Flows
NET CASH PROVIDED BY OPERATING ACTIVITIES	1,781	1,834
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, independent power and other investments and nuclear fuel purchases	(4,831)	(3,058)
Capital contributions from NEE	0	0
Sale of independent power and other investments of NEER	395	34
Proceeds from sale of a noncontrolling interest in subsidiaries	645	319
Other - net	(63)	2
Net cash used in investing activities	(3,854)	(2,703)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	4,494	3,377
Retirements of long-term debt	(2,392)	(2,547)
Proceeds from differential membership investors	328	46
Payments To Differential Membership Investors	(84)	(68)
Proceeds from notes payable	0	1,450
Repayments of notes payable	(212)	(313)
Net change in commercial paper	(154)	780
Issuances of common stock	0	0
Dividends on common stock	0	0
Contributions from (dividends to) NEE	294	(1,214)
Other - net	(113)	(55)
Net cash provided by (used in) financing activities	2,161	1,456
Net increase in cash and cash equivalents	88	587
Cash and cash equivalents at beginning of period	546	562
Cash and cash equivalents at end of period	634	1,149
Other Consolidated Entity And Consolidation Eliminations [Member]
Condensed Consolidating Statements of Cash Flows
NET CASH PROVIDED BY OPERATING ACTIVITIES	2,349	1,437
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures, independent power and other investments and nuclear fuel purchases	(3,097)	(2,618)
Capital contributions from NEE	432	1,454
Sale of independent power and other investments of NEER	0	0
Proceeds from sale of a noncontrolling interest in subsidiaries	0	0
Other - net	(31)	(139)
Net cash used in investing activities	(2,696)	(1,303)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt	150	85
Retirements of long-term debt	(262)	(550)
Proceeds from differential membership investors	0	0
Payments To Differential Membership Investors	0	0
Proceeds from notes payable	500	0
Repayments of notes payable	(150)	0
Net change in commercial paper	408	(896)
Issuances of common stock	0	0
Dividends on common stock	0	0
Contributions from (dividends to) NEE	(294)	1,214
Other - net	17	30
Net cash provided by (used in) financing activities	369	(117)
Net increase in cash and cash equivalents	22	17
Cash and cash equivalents at beginning of period	25	15
Cash and cash equivalents at end of period	$ 47	$ 32