Fair Value Measurements - Assets and Liabilities Accounted for at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Assets:
Inventories carried at market	$ 6,222	$ 6,961
Cash equivalents	280	70
Marketable securities	32	246
Segregated investments and restricted cash equivalents	1,771	1,681
Total Assets	9,252	10,066
Liabilities:
Inventory-related payables	730	742
Total Liabilities	1,487	1,714
Commodity contracts
Assets:
Unrealized gains on derivative contracts	822	831
Liabilities:
Unrealized losses on derivative contracts	613	760
Foreign exchange contracts
Assets:
Unrealized gains on derivative contracts	108	272
Liabilities:
Unrealized losses on derivative contracts	144	212
Interest rate contracts
Assets:
Unrealized gains on derivative contracts	17	5
Level 1
Assets:
Inventories carried at market	0	0
Cash equivalents	280	70
Marketable securities	32	246
Segregated investments and restricted cash equivalents	1,771	1,681
Total Assets	2,083	1,997
Liabilities:
Inventory-related payables	0	0
Total Liabilities	0	0
Level 1 | Commodity contracts
Assets:
Unrealized gains on derivative contracts	0	0
Liabilities:
Unrealized losses on derivative contracts	0	0
Level 1 | Foreign exchange contracts
Assets:
Unrealized gains on derivative contracts	0	0
Liabilities:
Unrealized losses on derivative contracts	0	0
Level 1 | Interest rate contracts
Assets:
Unrealized gains on derivative contracts	0	0
Level 2
Assets:
Inventories carried at market	3,549	3,930
Cash equivalents	0	0
Marketable securities	0	0
Segregated investments and restricted cash equivalents	0	0
Total Assets	3,984	4,611
Liabilities:
Inventory-related payables	714	654
Total Liabilities	1,158	1,221
Level 2 | Commodity contracts
Assets:
Unrealized gains on derivative contracts	310	404
Liabilities:
Unrealized losses on derivative contracts	300	355
Level 2 | Foreign exchange contracts
Assets:
Unrealized gains on derivative contracts	108	272
Liabilities:
Unrealized losses on derivative contracts	144	212
Level 2 | Interest rate contracts
Assets:
Unrealized gains on derivative contracts	17	5
Level 3
Assets:
Inventories carried at market	2,673	3,031
Cash equivalents	0	0
Marketable securities	0	0
Segregated investments and restricted cash equivalents	0	0
Total Assets	3,185	3,458
Liabilities:
Inventory-related payables	16	88
Total Liabilities	329	493
Level 3 | Commodity contracts
Assets:
Unrealized gains on derivative contracts	512	427
Liabilities:
Unrealized losses on derivative contracts	313	405
Level 3 | Foreign exchange contracts
Assets:
Unrealized gains on derivative contracts	0	0
Liabilities:
Unrealized losses on derivative contracts	0	0
Level 3 | Interest rate contracts
Assets:
Unrealized gains on derivative contracts	$ 0	$ 0