Fair Value Measurements - Roll Forward of Assets Measured at Fair Value on a Recurring Basis Using Unobservable Inputs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Unrealized gains (losses) relating to Level 3 assets	$ 311	$ 564
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	3,458	3,444
Total increase in net realized/unrealized gains included in cost of products sold	365	278
Purchases	4,086	3,789
Sales	(4,578)	(3,883)
Settlements	(228)	(352)
Transfers into Level 3	684	544
Transfers out of Level 3	(176)	(108)
Balance at end of period	3,611	3,712
Level 3 | Inventories  Carried at  Market
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	3,031	2,713
Total increase in net realized/unrealized gains included in cost of products sold	152	(97)
Purchases	4,086	3,789
Sales	(4,578)	(3,883)
Settlements	0	0
Transfers into Level 3	571	516
Transfers out of Level 3	(159)	(90)
Balance at end of period	3,103	2,948
Level 3 | Commodity Derivative Contracts Gains
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	427	731
Total increase in net realized/unrealized gains included in cost of products sold	213	375
Purchases	0	0
Sales	0	0
Settlements	(228)	(352)
Transfers into Level 3	113	28
Transfers out of Level 3	(17)	(18)
Balance at end of period	$ 508	$ 764