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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Inventory, Gross [Abstract]      
Natural gas, NGLs and refined products $ 914 $ 833  
Crude oil 352 251  
Spare parts and other 457 448  
Total inventories $ 1,723 $ 1,532 [1] $ 1,372
[1] *As adjusted. See Note 1.