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Commitments and Contingencies (Required Capacity and/or Minimum Payments Under Contracts) (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) MW | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Corporate and Other [Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Capacity payments and/or minimum payments - 2018 |  | $ 80 |  |
Capacity payments and/or minimum payments - 2019 |  | 15 |  |
Capacity payments and/or minimum payments - 2020 |  | 15 |  |
Capacity payments and/or minimum payments - 2021 |  | 10 |  |
Capacity payments and/or minimum payments - 2022 |  | 0 |  |
Capacity payments and/or minimum payments - Thereafter |  | 0 |  |
Commitment to invest |  | 75 |  |
Joint obligations due in the next year |  | 60 |  |
FPL[Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Capacity payments |  | 72 | $ 175 | $ 434
Energy payments |  | $ 90 | $ 126 | $ 262
FPL[Member] | Take-or-Pay Purchased Power Contract [Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Minimum purchase commitments (in megawatts) | MW |  | 375 |  |
FPL[Member] | Pay-for-Performance Contracts [Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Minimum purchase commitments (in megawatts) | MW |  | 114 |  |
FPL[Member] | Capacity Charges [Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Capacity payments and/or minimum payments - 2018 |  | $ 20 |  |
Capacity payments and/or minimum payments - 2019 |  | 20 |  |
Capacity payments and/or minimum payments - 2020 |  | 20 |  |
Capacity payments and/or minimum payments - 2021 |  | 20 |  |
Capacity payments and/or minimum payments - 2022 |  | 20 |  |
Capacity payments and/or minimum payments - Thereafter |  | 225 |  |
FPL[Member] | Natural Gas Including Transportation and Storage Contract Minimum Payments [Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Capacity payments and/or minimum payments - 2018 |  | 1,310 |  |
Capacity payments and/or minimum payments - 2019 |  | 865 |  |
Capacity payments and/or minimum payments - 2020 |  | 910 |  |
Capacity payments and/or minimum payments - 2021 |  | 905 |  |
Capacity payments and/or minimum payments - 2022 |  | 895 |  |
Capacity payments and/or minimum payments - Thereafter |  | 11,240 |  |
FPL[Member] | Natural Gas Including Transportation and Storage Contract Minimum Payments [Member] | Sabal Trail and Florida Southeast Connection [Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Capacity payments and/or minimum payments - 2018 |  | 295 |  |
Capacity payments and/or minimum payments - 2019 |  | 290 |  |
Capacity payments and/or minimum payments - 2020 |  | 360 |  |
Capacity payments and/or minimum payments - 2021 |  | 390 |  |
Capacity payments and/or minimum payments - 2022 |  | 390 |  |
Capacity payments and/or minimum payments - Thereafter |  | 7,175 |  |
FPL[Member] | Coal Including Transportation Contract Minimum Payments [Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Capacity payments and/or minimum payments - 2018 |  | 35 |  |
Capacity payments and/or minimum payments - 2019 |  | 5 |  |
Capacity payments and/or minimum payments - 2020 |  | 0 |  |
Capacity payments and/or minimum payments - 2021 |  | 0 |  |
Capacity payments and/or minimum payments - 2022 |  | 0 |  |
Capacity payments and/or minimum payments - Thereafter |  | 0 |  |
NEER [Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Capacity payments and/or minimum payments - 2018 |  | 1,700 |  |
Capacity payments and/or minimum payments - 2019 |  | 205 |  |
Capacity payments and/or minimum payments - 2020 |  | 120 |  |
Capacity payments and/or minimum payments - 2021 |  | 80 |  |
Capacity payments and/or minimum payments - 2022 |  | 100 |  |
Capacity payments and/or minimum payments - Thereafter |  | 290 |  |
NEER [Member] | Contract Group 1 [Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Commitment amount included in capital expenditures |  | 2,200 |  |
Jointly Owned Electricity Generation Plant [Member] | FPL[Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Plant in service, net book value |  | 191 |  |
Regulatory liabilities |  | 62 |  |
Jointly Owned Electricity Generation Plant [Member] | FPL[Member] | Forecast [Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Regulatory Assets | $ 150 |  |  |
Regulatory Asset, Amortization Period | 15 years |  |  |
Jointly Owned Electricity Generation Plant [Member] | Subsequent Event [Member] | FPL[Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Termination of operations, future payment | $ 90 |  |  |
Proportionate ownership share | 20.00% |  |  |
Jointly Owned Electricity Generation Plant [Member] | Subsequent Event [Member] | JEA [Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Proportionate ownership share | 80.00% |  |  |
Take-or-Pay Purchased Power Contract [Member] | Jointly Owned Electricity Generation Plant [Member] | FPL[Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Regulatory Assets |  | $ 90 |  |
Environmental Restoration Costs [Member] | Jointly Owned Electricity Generation Plant [Member] | FPL[Member] | Forecast [Member] |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Regulatory Asset, Amortization Period | 10 years |  |  |

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