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Summarized Financial Information of NEECH - Cash Flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net cash provided by operating activities $ 6,593 $ 6,458 [1] $ 6,369 [1]
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures, independent power and other investments and nuclear fuel purchases (13,004) (10,740) (9,636)
Capital contributions from NEE 0 0 0
Cash grants under the Recovery Act 3 78 [1] 335 [1]
Proceeds from sale of the fiber-optic telecommunications business 0 1,454 [1] 0 [1]
Sale of independent power and other investments of NEER 1,617 178 [1] 658 [1]
Proceeds from sale or maturity of securities in special use funds and other investments 3,410 3,207 [1] 3,776 [1]
Purchases of securities in special use funds and other investments (3,733) (3,244) [1] (3,829) [1]
Proceeds from sales of noncontrolling interests in NEP 0 0 [1] 645 [1]
Distributions from equity method investees 637 7 [1] 0 [1]
Other - net 120 142 [1] 5 [1]
Net cash used in investing activities (10,950) (8,918) [1] (8,046) [1]
CASH FLOWS FROM FINANCING ACTIVITIES      
Issuances of long-term debt 4,399 8,354 [1] 5,657 [1]
Retirements of long-term debt (3,102) (6,780) [1] (3,310) [1]
Proceeds from differential membership investors 1,841 1,414 [1] 1,859 [1]
Net change in commercial paper 1,062 1,419 [1] (106) [1]
Proceeds from other short-term debt 5,665 450 [1] 500 [1]
Repayments of other short-term debt (455) (2) [1] (662) [1]
Payments from related parties under a cash sweep and credit support agreement – net (21) 0 [1] 0 [1]
Issuances of common stock - net 718 55 [1] 537 [1]
Proceeds from issuance of NEP convertible preferred units - net 0 548 [1] 0 [1]
Dividends on common stock (2,101) (1,845) [1] (1,612) [1]
Contributions from (dividends to) NEE 0 0 0
Other - net (372) (725) [1] (439) [1]
Net cash provided by (used in) financing activities 7,634 2,888 [1] 2,424 [1]
Effects of currency translation on cash, cash equivalents and restricted cash (7) 26 [1] 10 [1]
Net increase in cash, cash equivalents and restricted cash 3,270 454 [1] 757 [1]
Cash, cash equivalents and restricted cash at beginning of year [1] 1,983 1,529 772
Cash, cash equivalents and restricted cash at end of year 5,253 1,983 [1] 1,529 [1]
Reportable Legal Entities [Member] | NEE (Guarantor) [Member]      
Net cash provided by operating activities 3,401 1,968 1,897
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures, independent power and other investments and nuclear fuel purchases (132) 0 (1)
Capital contributions from NEE (6,270) (92) (745)
Cash grants under the Recovery Act 0 0 0
Proceeds from sale of the fiber-optic telecommunications business 0 0 0
Sale of independent power and other investments of NEER 0 0 0
Proceeds from sale or maturity of securities in special use funds and other investments 0 9 0
Purchases of securities in special use funds and other investments 0 0 0
Proceeds from sales of noncontrolling interests in NEP 0 0 0
Distributions from equity method investees 4,466 0 0
Other - net 12 7 0
Net cash used in investing activities (1,924) (76) (746)
CASH FLOWS FROM FINANCING ACTIVITIES      
Issuances of long-term debt 0 0 0
Retirements of long-term debt 0 0 0
Proceeds from differential membership investors 0 0 0
Net change in commercial paper 0 0 0
Proceeds from other short-term debt 0 0 0
Repayments of other short-term debt 0 0 0
Payments from related parties under a cash sweep and credit support agreement – net 0 0  
Issuances of common stock - net 718 55 537
Proceeds from issuance of NEP convertible preferred units - net 0 0 0
Dividends on common stock (2,101) (1,845) (1,612)
Contributions from (dividends to) NEE 0 0 0
Other - net (96) (102) (75)
Net cash provided by (used in) financing activities (1,479) (1,892) (1,150)
Effects of currency translation on cash, cash equivalents and restricted cash 0 0 0
Net increase in cash, cash equivalents and restricted cash (2) 0 1
Cash, cash equivalents and restricted cash at beginning of year 1 1 0
Cash, cash equivalents and restricted cash at end of year (1) 1 1
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]      
Net cash provided by operating activities 2,094 2,749 2,155
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures, independent power and other investments and nuclear fuel purchases (7,735) (5,449) (5,701)
Capital contributions from NEE 0 0 0
Cash grants under the Recovery Act 3 78 335
Proceeds from sale of the fiber-optic telecommunications business 0 1,454 0
Sale of independent power and other investments of NEER 1,617 178 658
Proceeds from sale or maturity of securities in special use funds and other investments 1,178 1,221 1,281
Purchases of securities in special use funds and other investments (1,330) (1,163) (1,323)
Proceeds from sales of noncontrolling interests in NEP 0 0 645
Distributions from equity method investees 637 7 0
Other - net (133) 117 (19)
Net cash used in investing activities (5,763) (3,557) (4,124)
CASH FLOWS FROM FINANCING ACTIVITIES      
Issuances of long-term debt 2,651 6,393 5,349
Retirements of long-term debt (1,512) (5,907) (3,048)
Proceeds from differential membership investors 1,841 1,414 1,859
Net change in commercial paper 1,493 0 (318)
Proceeds from other short-term debt 5,665 0 0
Repayments of other short-term debt (205) 0 (212)
Payments from related parties under a cash sweep and credit support agreement – net (21) 0  
Issuances of common stock - net 0 0 0
Proceeds from issuance of NEP convertible preferred units - net 0 548 0
Dividends on common stock 0 0 0
Contributions from (dividends to) NEE (7,272) (633) (650)
Other - net (238) (601) (318)
Net cash provided by (used in) financing activities 2,402 1,214 2,662
Effects of currency translation on cash, cash equivalents and restricted cash (7) 26 10
Net increase in cash, cash equivalents and restricted cash (1,274) 432 703
Cash, cash equivalents and restricted cash at beginning of year 1,807 1,375 672
Cash, cash equivalents and restricted cash at end of year 533 1,807 1,375
Consolidation, Eliminations [Member]      
Net cash provided by operating activities 1,098 1,741 2,317
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures, independent power and other investments and nuclear fuel purchases (5,137) (5,291) (3,934)
Capital contributions from NEE 6,270 92 745
Cash grants under the Recovery Act 0 0 0
Proceeds from sale of the fiber-optic telecommunications business 0 0 0
Sale of independent power and other investments of NEER 0 0 0
Proceeds from sale or maturity of securities in special use funds and other investments 2,232 1,977 2,495
Purchases of securities in special use funds and other investments (2,403) (2,081) (2,506)
Proceeds from sales of noncontrolling interests in NEP 0 0 0
Distributions from equity method investees (4,466) 0 0
Other - net 241 18 24
Net cash used in investing activities (3,263) (5,285) (3,176)
CASH FLOWS FROM FINANCING ACTIVITIES      
Issuances of long-term debt 1,748 1,961 308
Retirements of long-term debt (1,590) (873) (262)
Proceeds from differential membership investors 0 0 0
Net change in commercial paper (431) 1,419 212
Proceeds from other short-term debt 0 450 500
Repayments of other short-term debt (250) (2) (450)
Payments from related parties under a cash sweep and credit support agreement – net 0 0  
Issuances of common stock - net 0 0 0
Proceeds from issuance of NEP convertible preferred units - net 0 0 0
Dividends on common stock 0 0 0
Contributions from (dividends to) NEE 7,272 633 650
Other - net (38) (22) (46)
Net cash provided by (used in) financing activities 6,711 3,566 912
Effects of currency translation on cash, cash equivalents and restricted cash 0 0 0
Net increase in cash, cash equivalents and restricted cash 4,546 22 53
Cash, cash equivalents and restricted cash at beginning of year 175 153 100
Cash, cash equivalents and restricted cash at end of year $ 4,721 $ 175 $ 153
[1] Amounts have been retrospectively adjusted as discussed in Note 14.