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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Decrease (increase) in:      
Accounts receivable - trade $ (1,934) $ (1,215)  
Accounts receivable - related parties (3) (2)  
Inventories 65 (96)  
Prepaid and other current assets 948 158  
Other assets 29 2  
Increase (decrease) in:      
Accounts payable - trade 216 84  
Accounts payable - related parties (105) (64)  
Accrued product payables 2,371 1,592  
Accrued interest (232) (231)  
Other current liabilities (1,132) (160)  
Other long-term liabilities (32) 31  
Net effect of changes in operating accounts 191 99  
Cash payments for interest, net of $17 and $20 capitalized during the three months ended March 31, 2022 and 2021, respectively 540 541  
Capitalized interest [1] 17 20  
Cash refunds for federal and state income taxes (14) $ (5)  
Liability for construction in progress expenditures $ 138   $ 183
[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.