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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax liabilities: |  |
Property-related | $ 9,030 | $ 13,094
Pension | 364 | 454
Nuclear decommissioning trusts | 226 | 253
Net unrealized gains on derivatives | 263 | 581
Investments in partnerships and joint ventures | 442 | 603
Other | 871 | 1,272
Total deferred tax liabilities | 11,196 | 16,257
Deferred tax assets and valuation allowance: |  |
Decommissioning reserves | 306 | 454
Postretirement benefits | 74 | 145
Net operating loss carryforwards | 482 | 427
Tax credit carryforwards | 3,126 | 3,059
ARO and accrued asset removal costs | 210 | 777
Deferred Tax Liabilities, Regulatory Assets | 1,267 | 84
Other | 646 | 940
Valuation allowance(b) | (252) | (269)
Net deferred tax assets | 5,859 | 5,617
Net deferred income taxes | 5,337 | 10,640
Deferred tax assets and liabilities included in the consolidated balance sheets [Abstract] |  |
Noncurrent other assets | 417 | 461
Deferred income taxes - noncurrent liabilities | (5,754) | (11,101)
Net deferred income taxes | (5,337) | (10,640)
FPL[Member] |  |
Deferred tax liabilities: |  |
Property-related | 6,045 | 8,882
Pension | 342 | 502
Nuclear decommissioning trusts | 0 | 0
Net unrealized gains on derivatives | 0 | 0
Investments in partnerships and joint ventures | 0 | 0
Other | 584 | 796
Total deferred tax liabilities | 6,971 | 10,180
Deferred tax assets and valuation allowance: |  |
Decommissioning reserves | 271 | 401
Postretirement benefits | 57 | 93
Net operating loss carryforwards | 3 | 3
Tax credit carryforwards | 0 | 0
ARO and accrued asset removal costs | 146 | 699
Deferred Tax Liabilities, Regulatory Assets | 1,273 | 84
Other | 216 | 359
Valuation allowance(b) | 0 | 0
Net deferred tax assets | 1,966 | 1,639
Net deferred income taxes | 5,005 | 8,541
Deferred tax assets and liabilities included in the consolidated balance sheets [Abstract] |  |
Noncurrent other assets | 0 | 0
Deferred income taxes - noncurrent liabilities | (5,005) | (8,541)
Net deferred income taxes | $ (5,005) | $ (8,541)

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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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