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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Decrease (increase) in:      
Accounts receivable - trade $ 1,384 $ 274  
Accounts receivable - related parties 2 0  
Inventories 736 1  
Prepaid and other current assets 111 (76)  
Other assets 13 (12)  
Increase (decrease) in:      
Accounts payable - trade (35) 52  
Accounts payable - related parties (107) (117)  
Accrued product payables (1,374) 379  
Accrued interest (275) (201)  
Other current liabilities (178) (288)  
Other long-term liabilities (74) (48)  
Net effect of changes in operating accounts 203 (36)  
Cash payments for interest, net of $45, and $25 capitalized during the three months ended March 31, 2025 and 2024, respectively 611 529  
Capitalized interest [1] 45 25  
Cash refunds for federal and state income taxes (3) $ (1)  
Liability for construction in progress expenditures $ 586   $ 490
[1] We capitalize interest costs incurred on funds used to construct property, plant and equipment while the asset is in its construction phase.  The capitalized interest is recorded as part of the asset to which it relates and is amortized over the asset’s estimated useful life as a component of depreciation expense.  When capitalized interest is recorded, it reduces interest expense from what it would be otherwise.