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Income Tax - Schedule of Differences on Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax liabilities: |  |
Property basis differences | $ 7,985 | $ 7,699
Regulatory assets: |  |
Unrecognized pension and other postretirement costs | 910 | 712
Environmental remediation costs | 243 | 205
Deferred storm costs | 31 | 22
Other regulatory assets | 536 | 376
Operating lease right-of-use asset | 220 | 231
Equity investments | 46 | 104
Total deferred tax liabilities | 9,971 | 9,349
Deferred tax assets: |  |
Accrued pension and other postretirement costs | 504 | 291
Future income tax | 617 | 678
Other regulatory liabilities | 656 | 702
Superfund and other environmental costs | 241 | 206
Asset retirement obligations | 178 | 135
Operating lease liabilities | 211 | 231
Loss carryforwards | 164 | 108
Tax credits carryforward | 1,022 | 896
Valuation allowance | (22) | (31)
Other | 59 | 47
Total deferred tax assets | 3,630 | 3,263
Net deferred tax liabilities | 6,341 | 6,086
Unamortized investment tax credits | 134 | 141
Net deferred tax liabilities and unamortized investment tax credits | 6,475 | 6,227
CECONY |  |
Deferred tax liabilities: |  |
Property basis differences | 6,901 | 6,640
Regulatory assets: |  |
Unrecognized pension and other postretirement costs | 861 | 674
Environmental remediation costs | 222 | 181
Deferred storm costs | 0 | 0
Other regulatory assets | 508 | 355
Operating lease right-of-use asset | 165 | 169
Equity investments | 0 | 0
Total deferred tax liabilities | 8,657 | 8,019
Deferred tax assets: |  |
Accrued pension and other postretirement costs | 427 | 222
Future income tax | 579 | 638
Other regulatory liabilities | 570 | 622
Superfund and other environmental costs | 219 | 183
Asset retirement obligations | 143 | 102
Operating lease liabilities | 165 | 170
Loss carryforwards | 34 | 0
Tax credits carryforward | 0 | 0
Valuation allowance | 0 | 0
Other | 127 | 103
Total deferred tax assets | 2,264 | 2,040
Net deferred tax liabilities | 6,393 | 5,979
Unamortized investment tax credits | 18 | 21
Net deferred tax liabilities and unamortized investment tax credits | $ 6,411 | $ 6,000

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