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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.