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Taxes (Details 2) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accumulated deferred income taxes |  |
Property basis differences | $ 5,037 | $ 4,737
Pension and OPEB | (698) | (629)
TMI-2 nuclear decommissioning | 89 | 82
AROs | (226) | (215)
Regulatory asset/liability | 445 | 414
Deferred compensation | (154) | (170)
Estimated worthless stock deduction | (1,007) | (1,004)
Loss carryforwards and AMT credits | (836) | (899)
Valuation reserve | 441 | 394
All other | (242) | (208)
Net deferred income tax liability | $ 2,849 | $ 2,502

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