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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 3,303	$ 2,941	$ 3,458	$ 3,444
Increase (decrease) in unrealized gains included in Cost of products sold	(65)	436	(432)	1,300
Increase (decrease) in unrealized losses included in Cost of products sold	0	0	0	0
Realized increases (decreases) included in Cost of products sold	(42)	(313)	(32)	(515)
Purchases	4,956	4,174	13,661	11,600
Sales	(4,499)	(3,736)	(12,945)	(11,813)
Settlements	(359)	(288)	(808)	(1,077)
Transfers into Level 3	457	423	1,725	1,553
Transfers out of Level 3	(796)	(533)	(1,672)	(1,388)
Balance at end of period	2,955	3,104	2,955	3,104
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	426	401	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	169	346	628	892
Realized increases (decreases) included in Cost of products sold	(5)	(6)	(8)	(26)
Purchases	7	8	14	10
Sales	(28)	(12)	(83)	(75)
Settlements	(293)	(251)	(806)	(823)
Transfers into Level 3	8	22	62	50
Transfers out of Level 3	(4)	(7)	(20)	(85)
Balance at end of period	280	501	280	501
Inventory-related Payables
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	41	34	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	7	3	11	17
Realized increases (decreases) included in Cost of products sold	(5)	(6)	(8)	(26)
Purchases	7	8	14	10
Sales	(28)	(12)	(83)	(75)
Settlements	0	0	0	0
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Balance at end of period	22	27	22	27
Commodity Derivative Contracts Losses
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	385	367	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	162	343	617	875
Realized increases (decreases) included in Cost of products sold	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Settlements	(293)	(251)	(806)	(823)
Transfers into Level 3	8	22	62	50
Transfers out of Level 3	(4)	(7)	(20)	(85)
Balance at end of period	258	474	258	474
Inventories  Carried at  Market
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	2,707	2,546	3,031	2,713
Increase (decrease) in unrealized gains included in Cost of products sold	(340)	221	(1,273)	512
Increase (decrease) in unrealized losses included in Cost of products sold	0	0	0	0
Realized increases (decreases) included in Cost of products sold	(42)	(313)	(32)	(515)
Purchases	4,956	4,174	13,661	11,600
Sales	(4,499)	(3,736)	(12,945)	(11,813)
Settlements	0	0	0	0
Transfers into Level 3	415	265	1,534	1,339
Transfers out of Level 3	(781)	(529)	(1,560)	(1,208)
Balance at end of period	2,416	2,628	2,416	2,628
Commodity Derivative Contracts Gains
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	596	395	427	731
Increase (decrease) in unrealized gains included in Cost of products sold	275	215	841	788
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	(359)	(288)	(808)	(1,077)
Transfers into Level 3	42	158	191	214
Transfers out of Level 3	(15)	(4)	(112)	(180)
Balance at end of period	$ 539	$ 476	$ 539	$ 476