Fair Value Measurements - Assets and Liabilities Accounted for at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Assets:
Inventories carried at market	$ 7,021	$ 6,961
Cash equivalents	413	70
Marketable securities	33	246
Segregated investments	1,899	1,681
Total Assets	10,308	10,066
Liabilities:
Inventory-related payables	1,452	742
Total Liabilities	2,299	1,714
Commodity contracts
Assets:
Unrealized gains on derivative contracts	782	831
Liabilities:
Unrealized losses on derivative contracts	733	760
Foreign currency contracts
Assets:
Unrealized gains on derivative contracts	145	272
Liabilities:
Unrealized losses on derivative contracts	114	212
Interest rate contracts
Assets:
Unrealized gains on derivative contracts	15	5
Level 1
Assets:
Inventories carried at market	0	0
Cash equivalents	413	70
Marketable securities	33	246
Segregated investments	1,899	1,681
Total Assets	2,345	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 currency 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	3,918	3,930
Cash equivalents	0	0
Marketable securities	0	0
Segregated investments	0	0
Total Assets	4,352	4,611
Liabilities:
Inventory-related payables	1,400	654
Total Liabilities	1,895	1,221
Level 2 | Commodity contracts
Assets:
Unrealized gains on derivative contracts	274	404
Liabilities:
Unrealized losses on derivative contracts	381	355
Level 2 | Foreign currency contracts
Assets:
Unrealized gains on derivative contracts	145	272
Liabilities:
Unrealized losses on derivative contracts	114	212
Level 2 | Interest rate contracts
Assets:
Unrealized gains on derivative contracts	15	5
Level 3
Assets:
Inventories carried at market	3,103	3,031
Cash equivalents	0	0
Marketable securities	0	0
Segregated investments	0	0
Total Assets	3,611	3,458
Liabilities:
Inventory-related payables	52	88
Total Liabilities	404	493
Level 3 | Commodity contracts
Assets:
Unrealized gains on derivative contracts	508	427
Liabilities:
Unrealized losses on derivative contracts	352	405
Level 3 | Foreign currency 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