v3.7.0.1

Summary of Significant Accounting and Reporting Policies (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Net income (loss) attributable to NEE | $ 793 | $ 540 | $ 2,376 | $ 1,193 |
Merchant Natural Gas Generation Facilities [Member] | NextEra Energy Resources [Member] |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Proceeds from sale of ownership interest in merchant natural gas generation facilities |  |  |  | 456 |
Gain on sale of ownership interest in merchant natural gas generation facilities |  |  |  | 254 |
Gain on sale of ownership interest in merchant natural gas facilities after-tax |  |  |  | $ 106 |
FPL FiberNet [Member] | Indirect Wholly-Owned Subsidiary [Member] |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Proceeds from sale of ownership interest in merchant natural gas generation facilities |  |  | 1,100 |  |
Retirement of debt |  |  | 370 |  |
Gain on sale of ownership interest in merchant natural gas generation facilities |  |  | 1,100 |  |
Gain on sale of ownership interest in merchant natural gas facilities after-tax |  |  | $ 685 |  |
Minimum [Member] | wind, natural gas and solar plants [Member] | NextEra Energy Resources [Member] |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Useful life |  |  | 30 years |  |
Maximum [Member] | wind, natural gas and solar plants [Member] | NextEra Energy Resources [Member] |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Useful life |  |  | 35 years |  |
Service Life [Member] |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Net income (loss) attributable to NEE | $ 15 |  | $ 30 |  |
Basic and diluted earnings per share (in dollars per share) | $ 0.03 |  | $ 0.06 |  |
Scenario, Forecast [Member] | Service Life [Member] |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Net income (loss) attributable to NEE |  |  |  |  | $ 60

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