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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 3,611	$ 3,712	$ 3,458	$ 3,444
Increase (decrease) in unrealized gains included in Cost of products sold	(677)	325	(367)	888
Increase (decrease) in unrealized losses included in Cost of products sold	0	0	0	0
Realized increases (decreases) included in Cost of products sold	(46)	59	10	(226)
Purchases	4,620	3,637	8,705	7,426
Sales	(3,868)	(4,194)	(8,446)	(8,077)
Settlements	(221)	(438)	(449)	(790)
Transfers into Level 3	584	586	1,268	1,130
Transfers out of Level 3	(700)	(746)	(876)	(854)
Balance at end of period	3,303	2,941	3,303	2,941
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	404	497	493	558
Increase (decrease) in unrealized gains included in Cost of products sold	0	0	0	0
Increase (decrease) in unrealized losses included in Cost of products sold	(266)	(208)	(459)	(546)
Realized increases (decreases) included in Cost of products sold	(1)	(9)	(3)	(21)
Purchases	4	2	7	3
Sales	19	26	55	64
Settlements	(237)	(282)	(513)	(572)
Transfers into Level 3	19	15	54	29
Transfers out of Level 3	(10)	(4)	(16)	(78)
Balance at end of period	426	401	426	401
Inventory-related Payables
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	52	62	88	101
Increase (decrease) in unrealized gains included in Cost of products sold	0	0	0	0
Increase (decrease) in unrealized losses included in Cost of products sold	(5)	(5)	(4)	(14)
Realized increases (decreases) included in Cost of products sold	(1)	(9)	(3)	(21)
Purchases	4	2	7	3
Sales	19	26	55	64
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	1
Transfers out of Level 3	0	0	0	0
Balance at end of period	41	34	41	34
Commodity Derivative Contracts Losses
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	352	435	405	457
Increase (decrease) in unrealized gains included in Cost of products sold	0	0	0	0
Increase (decrease) in unrealized losses included in Cost of products sold	(261)	(203)	(455)	(532)
Realized increases (decreases) included in Cost of products sold	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	(237)	(282)	(513)	(572)
Transfers into Level 3	19	15	54	28
Transfers out of Level 3	(10)	(4)	(16)	(78)
Balance at end of period	385	367	385	367
Inventories  Carried at  Market
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	3,103	2,948	3,031	2,713
Increase (decrease) in unrealized gains included in Cost of products sold	(1,030)	128	(933)	316
Increase (decrease) in unrealized losses included in Cost of products sold	0	0	0	0
Realized increases (decreases) included in Cost of products sold	(46)	59	10	(226)
Purchases	4,620	3,637	8,705	7,426
Sales	(3,868)	(4,194)	(8,446)	(8,077)
Settlements	0	0	0	0
Transfers into Level 3	548	557	1,119	1,073
Transfers out of Level 3	(620)	(589)	(779)	(679)
Balance at end of period	2,707	2,546	2,707	2,546
Commodity Derivative Contracts Gains
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	508	764	427	731
Increase (decrease) in unrealized gains included in Cost of products sold	353	197	566	572
Increase (decrease) in unrealized losses included in Cost of products sold	0	0	0	0
Realized increases (decreases) included in Cost of products sold	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	(221)	(438)	(449)	(790)
Transfers into Level 3	36	29	149	57
Transfers out of Level 3	(80)	(157)	(97)	(175)
Balance at end of period	$ 596	$ 395	$ 596	$ 395