Fair Value Measurements - Roll Forward of Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Unobservable Inputs (Details) - Level 3 - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 3,782	$ 3,611	$ 3,185	$ 3,458
Increase (decrease) in unrealized gains included in Cost of products sold	(840)	(677)	(175)	(367)
Increase in unrealized losses included in Cost of products sold	0	0	0	0
Realized (decreases) increases included in Cost of products sold	(1,015)	(46)	(1,260)	10
Purchases	5,266	4,620	9,816	8,705
Sales	(3,032)	(3,868)	(7,454)	(8,446)
Settlements	(277)	(221)	(526)	(449)
Transfers into Level 3	570	584	1,075	1,268
Transfers out of Level 3	(494)	(700)	(701)	(876)
Balance at end of period	3,960	3,303	3,960	3,303
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	664	404	329	493
Increase (decrease) in unrealized gains included in Cost of products sold	0	0	0	0
Increase in unrealized losses included in Cost of products sold	307	266	862	459
Realized (decreases) increases included in Cost of products sold	(1)	(1)	(4)	(3)
Purchases	14	4	29	7
Sales	(5)	(19)	(6)	(55)
Settlements	(401)	(237)	(623)	(513)
Transfers into Level 3	17	19	47	54
Transfers out of Level 3	(67)	(10)	(106)	(16)
Balance at end of period	528	426	528	426
Inventory-related Payables
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	30	52	16	88
Increase (decrease) in unrealized gains included in Cost of products sold	0	0	0	0
Increase in unrealized losses included in Cost of products sold	2	5	3	4
Realized (decreases) increases included in Cost of products sold	(1)	(1)	(4)	(3)
Purchases	14	4	29	7
Sales	(5)	(19)	(6)	(55)
Settlements	0	0	0	0
Transfers into Level 3	0	0	2	0
Transfers out of Level 3	0	0	0	0
Balance at end of period	40	41	40	41
Commodity Derivative Contracts Losses
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	634	352	313	405
Increase (decrease) in unrealized gains included in Cost of products sold	0	0	0	0
Increase in unrealized losses included in Cost of products sold	305	261	859	455
Realized (decreases) increases included in Cost of products sold	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	(401)	(237)	(623)	(513)
Transfers into Level 3	17	19	45	54
Transfers out of Level 3	(67)	(10)	(106)	(16)
Balance at end of period	488	385	488	385
Inventories  Carried at  Market
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	3,242	3,103	2,673	3,031
Increase (decrease) in unrealized gains included in Cost of products sold	(1,162)	(1,030)	(787)	(933)
Increase in unrealized losses included in Cost of products sold	0	0	0	0
Realized (decreases) increases included in Cost of products sold	(1,015)	(46)	(1,260)	10
Purchases	5,266	4,620	9,816	8,705
Sales	(3,032)	(3,868)	(7,454)	(8,446)
Settlements	0	0	0	0
Transfers into Level 3	554	548	1,049	1,119
Transfers out of Level 3	(491)	(620)	(675)	(779)
Balance at end of period	3,362	2,707	3,362	2,707
Commodity Derivative Contracts Gains
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	540	508	512	427
Increase (decrease) in unrealized gains included in Cost of products sold	322	353	612	566
Increase in unrealized losses included in Cost of products sold	0	0	0	0
Realized (decreases) increases included in Cost of products sold	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	(277)	(221)	(526)	(449)
Transfers into Level 3	16	36	26	149
Transfers out of Level 3	(3)	(80)	(26)	(97)
Balance at end of period	$ 598	$ 596	$ 598	$ 596