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Summarized Financial Information of NEECH (Statement of Cash Flows) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Condensed Consolidating Statements of Cash Flows        
NET CASH PROVIDED BY OPERATING ACTIVITIES $ 1,290 $ 1,258 [1]    
CASH FLOWS FROM INVESTING ACTIVITIES        
Capital expenditures, independent power and other investments and nuclear fuel purchases (3,588) (5,179)    
Proceeds from sale of the fiber-optic telecommunications business 0 1,484 [1]    
Capital contributions from NEE 0 0    
Proceeds from sale or maturity of securities in special use funds 919 735 [1]    
Purchases of securities in special use funds (1,039) (804) [1]    
Other - net 41 94 [1]    
Net cash used in investing activities (3,667) (3,670) [1]    
CASH FLOWS FROM FINANCING ACTIVITIES        
Issuances of long-term debt 1,804 689 [1]    
Retirements of long-term debt (942) (548) [1]    
Net change in commercial paper 1,277 2,041 [1]    
Proceeds from other short-term debt 0 200 [1]    
Repayments of other short-term debt (250) 0 [1]    
Issuances of common stock - net 7 7 [1]    
Dividends on common stock (523) (460) [1]    
Contributions from (dividends to) NEE 0 0    
Other - net (62) (246) [1]    
Net cash provided by (used in) financing activities 1,311 1,683 [1]    
Effects of currency translation on cash, cash equivalents and restricted cash (9) 0 [1]    
Net decrease in cash, cash equivalents and restricted cash (1,075) (729) [1]    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 908 800 [1] $ 1,983 $ 1,529 [1]
NextEra Energy (Guarantor) [Member]        
CASH FLOWS FROM FINANCING ACTIVITIES        
Repayments of other short-term debt   0    
Reportable Legal Entities [Member] | NextEra Energy (Guarantor) [Member]        
Condensed Consolidating Statements of Cash Flows        
NET CASH PROVIDED BY OPERATING ACTIVITIES 1,392 522    
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 (853) (38)    
Proceeds from sale or maturity of securities in special use funds 0 0    
Purchases of securities in special use funds 0 0    
Other - net 12 1    
Net cash used in investing activities (841) (37)    
CASH FLOWS FROM FINANCING ACTIVITIES        
Issuances 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      
Issuances of common stock - net 7 7    
Dividends on common stock (523) (460)    
Contributions from (dividends to) NEE 0 0    
Other - net (33) (32)    
Net cash provided by (used in) financing activities (549) (485)    
Effects of currency translation on cash, cash equivalents and restricted cash 0 0    
Net decrease in cash, cash equivalents and restricted cash 2 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 3 1 1 1
Reportable Legal Entities [Member] | NEECH Non-Guarantor Subsidiaries [Member]        
Condensed Consolidating Statements of Cash Flows        
NET CASH PROVIDED BY OPERATING ACTIVITIES 503 493    
CASH FLOWS FROM INVESTING ACTIVITIES        
Capital expenditures, independent power and other investments and nuclear fuel purchases (2,385) (3,413)    
Proceeds from sale of the fiber-optic telecommunications business 0 1,484    
Capital contributions from NEE 0 0    
Proceeds from sale or maturity of securities in special use funds 489 243    
Purchases of securities in special use funds (506) (285)    
Other - net 11 27    
Net cash used in investing activities (2,391) (1,944)    
CASH FLOWS FROM FINANCING ACTIVITIES        
Issuances of long-term debt 804 489    
Retirements of long-term debt (155) (514)    
Net change in commercial paper 1,403 1,085    
Proceeds from other short-term debt 0 0    
Repayments of other short-term debt 0 0    
Issuances of common stock - net 0 0    
Dividends on common stock 0 0    
Contributions from (dividends to) NEE (1,191) (89)    
Other - net (9) (224)    
Net cash provided by (used in) financing activities 852 747    
Effects of currency translation on cash, cash equivalents and restricted cash (9) 0    
Net decrease in cash, cash equivalents and restricted cash (1,045) (704)    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 762 671 1,807 1,375
Consolidation, Eliminations [Member]        
Condensed Consolidating Statements of Cash Flows        
NET CASH PROVIDED BY OPERATING ACTIVITIES (605) 243    
CASH FLOWS FROM INVESTING ACTIVITIES        
Capital expenditures, independent power and other investments and nuclear fuel purchases (1,203) (1,766)    
Proceeds from sale of the fiber-optic telecommunications business 0 0    
Capital contributions from NEE 853 38    
Proceeds from sale or maturity of securities in special use funds 430 492    
Purchases of securities in special use funds (533) (519)    
Other - net 18 66    
Net cash used in investing activities (435) (1,689)    
CASH FLOWS FROM FINANCING ACTIVITIES        
Issuances of long-term debt 1,000 200    
Retirements of long-term debt (787) (34)    
Net change in commercial paper (126) 956    
Proceeds from other short-term debt 0 200    
Repayments of other short-term debt (250) 0    
Issuances of common stock - net 0 0    
Dividends on common stock 0 0    
Contributions from (dividends to) NEE 1,191 89    
Other - net (20) 10    
Net cash provided by (used in) financing activities 1,008 1,421    
Effects of currency translation on cash, cash equivalents and restricted cash 0 0    
Net decrease in cash, cash equivalents and restricted cash (32) (25)    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 143 $ 128 $ 175 $ 153
[1] Prior period amounts have been retrospectively adjusted as discussed in Note 10 - Restricted Cash.