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Income Tax - Schedule of Differences on Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred tax liabilities: |  |
Property basis differences | $ 8,542 | $ 8,770
Regulatory Assets: |  |
System peak reduction and energy efficiency programs | 297 | 220
Environmental remediation costs | 310 | 278
Other regulatory assets | 632 | 561
Unrecognized pension and other postretirement costs | 0 | 22
Pensions and retiree benefits – asset | 918 | 917
Operating lease right-of-use asset | 154 | 230
Equity investments | 0 | 26
Total deferred tax liabilities | 10,853 | 11,024
Deferred tax assets: |  |
Unrecognized pension and other postretirement costs | 265 | 447
Future income tax | 427 | 489
Other regulatory liabilities | 844 | 860
Tax credits carryforward | 270 | 767
Loss carryforwards | 7 | 117
Valuation allowance | (7) | (18)
Superfund and other environmental costs | 314 | 280
Operating lease liabilities | 154 | 233
Pensions and retiree benefits – liability | 167 | 162
Asset retirement obligations | 146 | 153
Equity investments | 98 | 0
Other | 125 | 14
Total deferred tax assets | 2,810 | 3,504
Net deferred tax liabilities | 8,043 | 7,520
Unamortized investment tax credits | 26 | 121
Net deferred tax liabilities and unamortized investment tax credits | 8,069 | 7,641
CECONY |  |
Deferred tax liabilities: |  |
Property basis differences | 8,001 | 7,475
Regulatory Assets: |  |
System peak reduction and energy efficiency programs | 291 | 219
Environmental remediation costs | 287 | 254
Other regulatory assets | 577 | 501
Unrecognized pension and other postretirement costs | 0 | 22
Pensions and retiree benefits – asset | 894 | 894
Operating lease right-of-use asset | 153 | 163
Equity investments | 0 | 0
Total deferred tax liabilities | 10,203 | 9,528
Deferred tax assets: |  |
Unrecognized pension and other postretirement costs | 244 | 431
Future income tax | 394 | 454
Other regulatory liabilities | 744 | 739
Tax credits carryforward | 0 | 0
Loss carryforwards | 0 | 24
Valuation allowance | 0 | 0
Superfund and other environmental costs | 288 | 254
Operating lease liabilities | 153 | 162
Pensions and retiree benefits – liability | 153 | 148
Asset retirement obligations | 146 | 140
Equity investments | 0 | 0
Other | 108 | 45
Total deferred tax assets | 2,230 | 2,397
Net deferred tax liabilities | 7,973 | 7,131
Unamortized investment tax credits | 11 | 13
Net deferred tax liabilities and unamortized investment tax credits | $ 7,984 | $ 7,144

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