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Income Taxes - Narrative (Details) $ in Billions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Operating Loss Carryforwards [Line Items] |
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax liability, income tax expense (benefit) | $ 6.5
FPL[Member] |
Operating Loss Carryforwards [Line Items] |
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax liability, income tax expense (benefit) | 4.5
NEER [Member] |
Operating Loss Carryforwards [Line Items] |
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax liability, income tax expense (benefit) | $ 2.0

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