Supplemental Cash Flow Information (Details) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Decrease (increase) in:
Accounts receivable - trade		$ 274	$ 356
Accounts receivable - related parties		0	3
Inventories		1	362
Prepaid and other current assets		(76)	(358)
Other assets		(12)	3
Increase (decrease) in:
Accounts payable - trade		52	(21)
Accounts payable - related parties		(117)	(168)
Accrued product payables		379	(600)
Accrued interest		(201)	(187)
Other current liabilities		(288)	161
Other long-term liabilities		(48)	10
Net effect of changes in operating accounts		(36)	(439)
Cash payments for interest, net of $25 and $32 capitalized during the three months ended March 31, 2024, and 2023 respectively		529	494
Capitalized interest	[1]	25	32
Cash payments (refunds) for federal and state income taxes		(1)	$ 2
Liability for construction in progress expenditures		$ 498		$ 400

[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.