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Supplementary Financial Information - Summary of Inventories by Major Category and Other Investments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Inventories by Major Category
Materials and supplies	$ 289	$ 274
Fuel stock	420	252
Natural gas in storage	31	44
Total inventories	740	570
Other Investments
Nuclear decommissioning trust	1,951	1,648
Assets related to employee benefit plans	28	30
Land investments	42	41
Miscellaneous other	14	10
Total investments	$ 2,035	$ 1,729

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Decommission fund to pay for the costs of decontaminating and decommissioning of facilities through collection of revenues derived from utility assessments and government appropriations. Decommission fund investment for the process whereby a power station, at the end of its economic life, is taken permanently out of service and its site made available for other purposes. In the case of a nuclear station this comprises three different states of clearance. Immediately after the final closure, radioactive material such as nuclear fuel and operational waste is removed and the buildings surrounding the reactor shield are dismantled and finally the reactor itself is dismantled.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Aggregated amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed. This amount is net of valuation reserves and adjustments.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Energy Related Inventory, Natural Gas in Storage, Net of Reserves

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Miscellaneous other investments

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