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Income Tax - Schedule of Differences on Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Deferred tax liabilities: |  |
Property basis differences | $ 9,222 | $ 8,542
Regulatory Assets: |  |
Energy efficiency and other clean energy programs | 464 | 351
Environmental remediation costs | 291 | 310
Legacy meters | 116 | 4
Other regulatory assets | 571 | 574
Pensions and retiree benefits – asset | 1,063 | 918
Operating lease right-of-use asset | 143 | 154
Total deferred tax liabilities | 11,870 | 10,853
Deferred tax assets: |  |
Unrecognized pension and other postretirement costs | 296 | 265
Future income tax | 343 | 427
Other regulatory liabilities | 909 | 844
Tax credits carryforward | 346 | 270
Superfund and other environmental costs | 291 | 314
Pensions and retiree benefits – liability | 154 | 167
Corporate alternative minimum tax credit carryforward | 139 | 0
Operating lease liabilities | 143 | 154
Asset retirement obligations | 127 | 146
Equity investments | 80 | 98
Loss carryforwards | 42 | 7
Valuation allowance | (12) | (7)
Other | 160 | 125
Total deferred tax assets | 3,018 | 2,810
Net deferred tax liabilities | 8,852 | 8,043
Unamortized investment tax credits | 22 | 26
Net deferred tax liabilities and unamortized investment tax credits | 8,874 | 8,069
CECONY |  |
Deferred tax liabilities: |  |
Property basis differences | 8,632 | 8,001
Regulatory Assets: |  |
Energy efficiency and other clean energy programs | 449 | 344
Environmental remediation costs | 267 | 287
Legacy meters | 112 | 0
Other regulatory assets | 510 | 525
Pensions and retiree benefits – asset | 1,037 | 894
Operating lease right-of-use asset | 142 | 153
Total deferred tax liabilities | 11,149 | 10,204
Deferred tax assets: |  |
Unrecognized pension and other postretirement costs | 276 | 244
Future income tax | 312 | 394
Other regulatory liabilities | 809 | 744
Tax credits carryforward | 0 | 0
Superfund and other environmental costs | 265 | 288
Pensions and retiree benefits – liability | 142 | 153
Corporate alternative minimum tax credit carryforward | 111 | 0
Operating lease liabilities | 142 | 153
Asset retirement obligations | 127 | 146
Equity investments | 0 | 0
Loss carryforwards | 16 | 0
Valuation allowance | 0 | 0
Other | 140 | 109
Total deferred tax assets | 2,340 | 2,231
Net deferred tax liabilities | 8,809 | 7,973
Unamortized investment tax credits | 10 | 11
Net deferred tax liabilities and unamortized investment tax credits | $ 8,819 | $ 7,984

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