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Estimates (Schedule of Inventory) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Inventory, Net [Abstract] |  |  |
Natural gas, NGLs and refined products (1) | [1] | $ 833 | $ 833
Crude oil |  | 654 | 506
Spare parts and other |  | 448 | 338
Total inventories |  | $ 1,935 | $ 1,677
[1] | Due to changes in fuel prices, Sunoco LP recorded a write-down on the value of its fuel inventory of $85 million as of December 31, 2018.

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