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Estimates (Schedule of Inventory) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Inventory, Net [Abstract] |  |
Natural gas, NGLs and refined products | $ 1,259 | $ 1,013
Crude oil | 328 | 287
Spare parts and other | 427 | 439
Total inventories | $ 2,014 | $ 1,739

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