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Summarized Financial Information of NEECH (Cash Flow Statement) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities $ 2,933 $ 3,251 [1]
Capital Expenditures Independent Power Investments And Nuclear Fuel Purchases (5,923) (6,937)
Proceeds from sale of the fiber-optic telecommunications business 0 1,482 [1]
Capital contribution to Subsidiary 0 0
Proceeds from sale or maturity of securities in special use funds 1,788 1,419 [1]
Purchases of securities in special use funds (1,992) (1,531) [1]
Distributions from equity method investees 633 7 [1]
Other - net 139 46 [1]
Net cash used in investing activities (5,355) (5,514) [1]
Proceeds from Issuance of Long-term Debt 2,875 2,771 [1]
Retirements of long-term debt (1,214) (1,885) [1]
Net change in commercial paper 705 1,847 [1]
Proceeds from other short-term debt 200 200 [1]
Repayments of other short-term debt (250) 0 [1]
Proceeds from Issuance of Common Stock 11 25 [1]
Payments of Dividends (1,047) (920) [1]
Cash Dividends Received from (Paid to) Parent Company 0 0
Other - net (90) (361) [1]
Net cash provided by (used in) financing activities 1,190 1,677 [1]
Effects of currency translation on cash, cash equivalents and restricted cash (15) 0 [1]
Net decrease in cash, cash equivalents and restricted cash (1,247) (586) [1]
Cash, cash equivalents and restricted cash at beginning of period 1,983 1,529 [1]
Cash, cash equivalents and restricted cash at end of period 736 943 [1]
Reportable Legal Entities [Member] | NextEra Energy (Guarantor) [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities 2,005 992
Capital Expenditures Independent Power Investments And Nuclear Fuel Purchases (71) 0
Proceeds from sale of the fiber-optic telecommunications business 0 0
Capital contribution to Subsidiary (854) (45)
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 0 0
Other - net 12 4
Net cash used in investing activities (913) (41)
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
Proceeds from Issuance of Common Stock 11 25
Payments of Dividends (1,047) (920)
Cash Dividends Received from (Paid to) Parent Company 0 0
Other - net (56) (56)
Net cash provided by (used in) financing activities (1,092) (951)
Effects of currency translation on cash, cash equivalents and restricted cash 0 0
Net decrease in cash, cash equivalents and restricted cash 0 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 1,459 1,260
Capital Expenditures Independent Power Investments And Nuclear Fuel Purchases (3,348) (4,195)
Proceeds from sale of the fiber-optic telecommunications business 0 1,482
Capital contribution to Subsidiary 0 0
Proceeds from sale or maturity of securities in special use funds 687 518
Purchases of securities in special use funds (764) (582)
Distributions from equity method investees 633 7
Other - net 105 43
Net cash used in investing activities (2,687) (2,727)
Proceeds from Issuance of Long-term Debt 1,281 2,572
Retirements of long-term debt (415) (1,850)
Net change in commercial paper 1,405 1,115
Proceeds from other short-term debt 200 0
Repayments of other short-term debt 0 0
Proceeds from Issuance of Common Stock 0 0
Payments of Dividends 0 0
Cash Dividends Received from (Paid to) Parent Company (2,408) (637)
Other - net (6) (304)
Net cash provided by (used in) financing activities 57 896
Effects of currency translation on cash, cash equivalents and restricted cash (15) 0
Net decrease in cash, cash equivalents and restricted cash (1,186) (571)
Cash, cash equivalents and restricted cash at beginning of period 1,807 1,375
Cash, cash equivalents and restricted cash at end of period 621 804
Consolidation, Eliminations [Member]    
Condensed Financial Statements, Captions [Line Items]    
Net cash provided by operating activities (531) 999
Capital Expenditures Independent Power Investments And Nuclear Fuel Purchases (2,504) (2,742)
Proceeds from sale of the fiber-optic telecommunications business 0 0
Capital contribution to Subsidiary 854 45
Proceeds from sale or maturity of securities in special use funds 1,101 901
Purchases of securities in special use funds (1,228) (949)
Distributions from equity method investees 0 0
Other - net 22 (1)
Net cash used in investing activities (1,755) (2,746)
Proceeds from Issuance of Long-term Debt 1,594 199
Retirements of long-term debt (799) (35)
Net change in commercial paper (700) 732
Proceeds from other short-term debt 0 200
Repayments of other short-term debt (250) 0
Proceeds from Issuance of Common Stock 0 0
Payments of Dividends 0 0
Cash Dividends Received from (Paid to) Parent Company 2,408 637
Other - net (28) (1)
Net cash provided by (used in) financing activities 2,225 1,732
Effects of currency translation on cash, cash equivalents and restricted cash 0 0
Net decrease in cash, cash equivalents and restricted cash (61) (15)
Cash, cash equivalents and restricted cash at beginning of period 175 153
Cash, cash equivalents and restricted cash at end of period $ 114 $ 138
[1] Prior period amounts have been retrospectively adjusted as discussed in Note 11 - Restricted Cash.