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Summary of Significant Accounting and Reporting Policies (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) MW | Jun. 30, 2019 USD ($) wind_generation_facility solar_generation_facility MW | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | [1] | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | [1] | Dec. 31, 2018 USD ($)
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Restricted Cash and Cash Equivalents | $ 427 |  | $ 427 |  | $ 427 |  | $ 4,615
Restricted cash related to margin cash collateral that is netted against derivative instruments | 55 |  | 55 |  | 55 |  | 184
Gain in connection with sale |  |  | (2) | $ 6 | 378 | $ 48 |
FPL [Member] |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Storm Restoration Costs | 274 |  | 274 |  | 274 |  |
Storm restoration costs in excess of storm and property insurance reserve | 166 |  | 166 |  | 166 |  |
Restricted Cash and Cash Equivalents | $ 151 |  | 151 |  | 151 |  | 142
NextEra Energy Resources [Member] |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Wind electric generating facility capability (in megawatts) | MW | 220 |  |  |  |  |  |
Other Current Liabilities [Member] |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Accrued Storm Restoration Costs | $ 240 |  | 240 |  | 240 |  |
Other Current Liabilities [Member] | FPL [Member] |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Accrued Storm Restoration Costs | 240 |  | 240 |  | 240 |  |
Other Current Assets [Member] |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Restricted cash and cash equivalents, current | 338 |  | 338 |  | 338 |  | 89
Other Current Assets [Member] | FPL [Member] |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Restricted cash and cash equivalents, current | 62 |  | 62 |  | 62 |  | $ 81
Taxes other than income taxes and other - net [Member] | NextEra Energy Resources [Member] |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Write-off of capitalized development costs |  |  | 73 |  | 73 |  |
Write-off of capitalized development costs, net |  |  | 54 |  | 54 |  |
Three Wind Generation Facilities And Three Solar Generation Facilities [Member] | Disposed of by Sale [Member] |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Gain in connection with sale |  |  |  |  | 341 |  |
Gain in connection with sale, after tax |  |  |  |  | 259 |  |
Noncontrolling interest | 118 |  | 118 |  | 118 |  |
Three Wind Generation Facilities And Three Solar Generation Facilities [Member] | Disposed of by Sale [Member] | NextEra Energy Resources [Member] |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Generating capacity (MW) | MW |  | 611 |  |  |  |  |
Purchase price |  | $ 1,020 |  |  |  |  |
Working capital | $ 12 |  | $ 12 |  | $ 12 |  |
Wind plants [Member] | Disposed of by Sale [Member] | NextEra Energy Resources [Member] |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Number of generation facilities purchased | wind_generation_facility |  | 3 |  |  |  |  |
Solar plants [Member] | Disposed of by Sale [Member] | NextEra Energy Resources [Member] |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Number of generation facilities purchased | solar_generation_facility |  | 3 |  |  |  |  |
Solar plants [Member] | Disposed of by Sale [Member] | Noncontrolling Interest [Member] | NextEra Energy Resources [Member] |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |
Number of generation facilities purchased | solar_generation_facility |  | 2 |  |  |  |  |
[1] | Amounts have been retrospectively adjusted for an accounting standards update related to leases.

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