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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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Carrying amount as of the balance sheet date of natural gas in storage, which is a mixture of gases (liquefied or otherwise), used for fuel and manufacturing purposes, which is ready for sale.

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Carrying amount as of the balance sheet date of finished goods inventories for petroleum products, crude oil, petrochemical products, and other oil and gas inventories.

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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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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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