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v3.8.0.1

Segment Information (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting [Abstract] |  |  |
Percentage of operating revenues derived from the sale of electricity (in hundredths) | 93.00% | 90.00% | 92.00%
Maximum percentage of operating revenues from foreign sources (in hundredths) | 2.00% | 2.00% | 2.00%
Maximum percentage of long-lived assets located in foreign countries (in hundredths) | 3.00% | 3.00% |

X
- Definition The maximum percentage of long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets, located in foreign countries in total in which the entity holds assets. + References No definition available. + Details
Name: | nee_MaximumPercentageOfLongLivedAssetsLocatedInForeignCountries
Namespace Prefix: | nee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The maximum percentage of revenues from external customers attributed to all foreign countries in total from which the entity derives revenues. + References No definition available. + Details
Name: | nee_MaximumPercentageOfOperatingRevenuesFromForeignSources
Namespace Prefix: | nee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The approximate percentage of total operating revenues derived from the sale of electricity during the period. + References No definition available. + Details
Name: | nee_PercentageOfOperatingRevenuesDerivedFromSaleOfElectricity
Namespace Prefix: | nee_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration