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Income Tax - Schedule of Differences on Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax liabilities: |  |
Property basis differences | $ 7,699 | $ 7,402
Regulatory assets: |  |
Unrecognized pension and other postretirement costs | 712 | 627
Environmental remediation costs | 205 | 227
Deferred storm costs | 22 | 21
Other regulatory assets | 376 | 273
Operating lease right-of-use asset | 231 | 0
Equity investments | 104 | 102
Total deferred tax liabilities | 9,349 | 8,652
Deferred tax assets: |  |
Accrued pension and other postretirement costs | 291 | 248
Future income tax | 678 | 702
Other regulatory liabilities | 702 | 632
Superfund and other environmental costs | 206 | 218
Asset retirement obligations | 135 | 114
Operating lease liabilities | 231 | 0
Loss carryforwards | 108 | 229
Tax credits carryforward | 896 | 817
Valuation allowance | (40) | (33)
Other | 56 | 53
Total deferred tax assets | 3,263 | 2,980
Net deferred tax liabilities | 6,086 | 5,672
Unamortized investment tax credits | 141 | 148
Net deferred tax liabilities and unamortized investment tax credits | 6,227 | 5,820
CECONY |  |
Deferred tax liabilities: |  |
Property basis differences | 6,640 | 6,446
Regulatory assets: |  |
Unrecognized pension and other postretirement costs | 674 | 591
Environmental remediation costs | 181 | 200
Deferred storm costs | 0 | 0
Other regulatory assets | 355 | 252
Operating lease right-of-use asset | 169 | 0
Equity investments | 0 | 0
Total deferred tax liabilities | 8,019 | 7,489
Deferred tax assets: |  |
Accrued pension and other postretirement costs | 222 | 180
Future income tax | 638 | 662
Other regulatory liabilities | 622 | 554
Superfund and other environmental costs | 183 | 194
Asset retirement obligations | 102 | 82
Operating lease liabilities | 170 | 0
Loss carryforwards | 0 | 0
Tax credits carryforward | 0 | 0
Valuation allowance | 0 | 0
Other | 103 | 102
Total deferred tax assets | 2,040 | 1,774
Net deferred tax liabilities | 5,979 | 5,715
Unamortized investment tax credits | 21 | 24
Net deferred tax liabilities and unamortized investment tax credits | $ 6,000 | $ 5,739

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