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Income Taxes - Reconciliation Between the Effective Income Tax Rates and the Applicable Statutory Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Statutory federal income tax rate | 21.00% | 21.00% | 21.00% | 21.00%
Increases (reductions) resulting from: |  |  |  |
State income taxes - net of federal income tax benefit | 2.00% | 6.50% | 3.00% | 4.70%
Taxes attributable to noncontrolling interests | 1.60% | 2.20% | 1.80% | 2.40%
PTCs and ITCs - NEER | (5.20%) | (5.90%) | (6.30%) | (1.90%)
Amortization of deferred regulatory credit | (9.20%) | (3.20%) | (7.70%) | (1.00%)
Other - net | (0.40%) | 4.20% | (1.60%) | (0.60%)
Effective income tax rate | 9.80% | 24.80% | 10.20% | 24.60%
Tax Cuts and Jobs Act of 2017, income tax expense (benefit) |  |  |  | $ 125
FPL [Member] |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |
Statutory federal income tax rate | 21.00% | 21.00% | 21.00% | 21.00%
Increases (reductions) resulting from: |  |  |  |
State income taxes - net of federal income tax benefit | 1.60% | 4.30% | 3.00% | 4.30%
Taxes attributable to noncontrolling interests | 0.00% | 0.00% | 0.00% | 0.00%
PTCs and ITCs - NEER | 0.00% | 0.00% | 0.00% | 0.00%
Amortization of deferred regulatory credit | (15.60%) | (3.70%) | (9.60%) | (4.20%)
Other - net | 0.10% | 0.30% | (0.20%) | (0.50%)
Effective income tax rate | 7.10% | 21.90% | 14.20% | 20.60%
Income tax benefits related to the amortization of deferred regulatory credits | $ 83 |  | $ 83 |
Amortization period |  |  | 10 years |

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