Fair Value Measurements - Reconciliation Of Assets Measured At Fair Value On A Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Unrealized gains (losses) relating to Level 3 assets	$ 436	$ 438	$ 1,300	$ 1,800
Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	2,941	3,745	3,444	3,301
Total increase (decrease) in net realized/unrealized gains included in cost of products sold	123	465	785	1,781
Purchases	4,174	6,615	11,600	25,190
Sales	(3,736)	(6,539)	(11,813)	(25,439)
Settlements	(288)	(356)	(1,077)	(1,199)
Transfers into Level 3	423	385	1,553	1,827
Transfers out of Level 3	(533)	(553)	(1,388)	(1,699)
Balance at end of period	3,104	3,762	3,104	3,762
Level 3 | Inventories  Carried at  Market
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	2,546	2,859	2,713	2,760
Total increase (decrease) in net realized/unrealized gains included in cost of products sold	(92)	135	(3)	499
Purchases	4,174	6,615	11,600	25,190
Sales	(3,736)	(6,539)	(11,813)	(25,439)
Settlements	0	0	0	(4)
Transfers into Level 3	265	336	1,339	1,488
Transfers out of Level 3	(529)	(534)	(1,208)	(1,622)
Balance at end of period	2,628	2,872	2,628	2,872
Level 3 | Commodity Derivative Contracts Gains
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	395	886	731	541
Total increase (decrease) in net realized/unrealized gains included in cost of products sold	215	330	788	1,282
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	(288)	(356)	(1,077)	(1,195)
Transfers into Level 3	158	49	214	339
Transfers out of Level 3	(4)	(19)	(180)	(77)
Balance at end of period	$ 476	$ 890	$ 476	$ 890