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Debt - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Aug. 31, 2018
September 2015 Equity Units [Member] |  |
Debt Instrument [Line Items] |  |
Shares of common stock issued | 6,215,998 |
Exchange received on issuance of common stock | $ 700 |
NextEra Energy Capital Holdings, Inc. [Member] | Series H Debentures Due September 1, 2020 [Member] | Debentures [Member] |  |
Debt Instrument [Line Items] |  |
Remarketed principal amount |  | $ 700
Interest Rate (as a percent) |  | 3.342%

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