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Estimates (Schedule of Inventory) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Inventory, Net [Abstract] |  |  |
Natural gas, NGLs and refined products (1) | [1] | $ 1,013 | $ 833
Crude oil |  | 287 | 251
Spare parts and other |  | 439 | 448
Total inventories |  | $ 1,739 | $ 1,532
[1] | Due to changes in fuel prices, Sunoco LP recorded a write-down on the value of its fuel inventory of $82 million for the year ended December 31, 2020.

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