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Inventories Table - Inventory Balances (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Inventory, Net [Abstract]      
Other Inventory, Supplies, Gross $ 457 $ 448  
Natural gas, NGLs, and refined products 914 833  
Energy Related Inventory, Crude Oil, Products and Merchandise 352 251  
Inventory, Net $ 1,723 $ 1,532 [1] $ 1,372
[1] *As adjusted. See Note 1.