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Income Taxes - Components of Deferred Income Tax Liability (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
DEFERRED TAX ASSETS |  |
Risk management activities | $ 25,103 | $ 26,614
Regulatory liabilities: |  |
Excess Deferred Income Taxes - Tax Cuts and Jobs Act | 376,906 | 0
Asset retirement obligation and removal costs | 135,847 | 200,140
Unamortized investment tax credits | 54,661 | 113,195
Other postretirement liabilities | 47,021 | 60,375
Other | 37,489 | 63,311
Pension liabilities | 83,126 | 204,436
Renewable energy incentives | 33,546 | 56,379
Credit and loss carryforwards | 53,946 | 75,944
Other | 102,432 | 158,421
Total deferred tax assets | 950,077 | 958,815
DEFERRED TAX LIABILITIES |  |
Plant-related | (2,220,886) | (3,297,989)
Risk management activities | (491) | (7,594)
Other postretirement assets | (66,134) | (63,477)
Regulatory assets: |  |
Allowance for equity funds used during construction | (36,365) | (61,088)
Deferred fuel and purchased power — mark-to-market | (40,778) | (21,396)
Pension benefits | (142,848) | (274,184)
Retired power plant costs (see Note 3) | (53,611) | (49,166)
Other | (74,423) | (123,987)
Other | (5,346) | (5,166)
Total deferred tax liabilities | (2,640,882) | (3,904,047)
Deferred income taxes — net | (1,690,805) | (2,945,232)
ARIZONA PUBLIC SERVICE COMPANY |  |
DEFERRED TAX ASSETS |  |
Risk management activities | 25,103 | 26,614
Regulatory liabilities: |  |
Excess Deferred Income Taxes - Tax Cuts and Jobs Act | 376,906 | 0
Asset retirement obligation and removal costs | 135,847 | 200,140
Unamortized investment tax credits | 54,661 | 113,195
Other postretirement liabilities | 47,021 | 60,375
Other | 37,489 | 63,311
Pension liabilities | 77,280 | 194,981
Renewable energy incentives | 33,546 | 56,379
Credit and loss carryforwards | 1,920 | 1,645
Other | 108,223 | 187,453
Total deferred tax assets | 897,996 | 904,093
DEFERRED TAX LIABILITIES |  |
Plant-related | (2,220,886) | (3,297,989)
Risk management activities | (491) | (7,594)
Other postretirement assets | (65,733) | (62,819)
Regulatory assets: |  |
Allowance for equity funds used during construction | (36,365) | (61,088)
Deferred fuel and purchased power — mark-to-market | (40,778) | (21,396)
Pension benefits | (142,848) | (274,184)
Retired power plant costs (see Note 3) | (53,611) | (49,166)
Other | (74,423) | (123,987)
Other | (5,346) | (5,165)
Total deferred tax liabilities | (2,640,481) | (3,903,388)
Deferred income taxes — net | $ (1,742,485) | $ (2,999,295)

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