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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax liabilities: |  |
Property-related | $ 10,133 | $ 9,315
Pension | 417 | 374
Investments in partnerships and joint ventures | 2,019 | 1,925
Other | 1,618 | 1,505
Total deferred tax liabilities | 14,187 | 13,119
Deferred tax assets and valuation allowance: |  |
Decommissioning reserves | 317 | 313
Net operating loss carryforwards | 380 | 350
Tax credit carryforwards | 3,406 | 3,259
ARO and accrued asset removal costs | 368 | 310
Regulatory liabilities | 1,335 | 1,277
Other | 515 | 751
Valuation allowance | (285) | (273)
Net deferred tax assets | 6,036 | 5,987
Net deferred income taxes | 8,151 | 7,132
Deferred tax assets and liabilities included in the consolidated balance sheets [Abstract] |  |
Noncurrent other assets | 210 | 235
Deferred income taxes - noncurrent liabilities | (8,361) | (7,367)
Net deferred income taxes | (8,151) | (7,132)
FPL[Member] |  |
Deferred tax liabilities: |  |
Property-related | 6,394 | 6,113
Pension | 374 | 357
Investments in partnerships and joint ventures | 0 | 0
Other | 685 | 791
Total deferred tax liabilities | 7,453 | 7,261
Deferred tax assets and valuation allowance: |  |
Decommissioning reserves | 286 | 278
Net operating loss carryforwards | 2 | 3
Tax credit carryforwards | 0 | 0
ARO and accrued asset removal costs | 273 | 237
Regulatory liabilities | 1,219 | 1,283
Other | 258 | 295
Valuation allowance | 0 | 0
Net deferred tax assets | 2,038 | 2,096
Net deferred income taxes | 5,415 | 5,165
Deferred tax assets and liabilities included in the consolidated balance sheets [Abstract] |  |
Noncurrent other assets | 0 | 0
Deferred income taxes - noncurrent liabilities | (5,415) | (5,165)
Net deferred income taxes | $ (5,415) | $ (5,165)

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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from estimated decommissioning reserves, which can only be deducted for tax purposes when expenses are actually incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken. + References No definition available. + Details
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