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Inventories Table - Inventory Balances (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Inventory [Line Items]    
Natural gas, NGLs, and refined products $ 1,020 $ 1,013
Crude Oil 350 287
Spare parts and other 440 439
Inventory, Net $ 1,810 $ 1,739