Fair Value Measurements - Fair Value Measurements At Reporting Date (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Assets:
Unrealized gains on derivative contracts	$ 1,159	$ 1,546
Liabilities:
Unrealized losses on derivative contracts	1,148	1,101
Recurring
Assets:
Inventories carried at market	6,094	6,987
Cash equivalents	218	209
Segregated investments	1,595	1,362
Total Assets	9,066	10,104
Liabilities:
Inventory-related payables	801	1,320
Total Liabilities	1,949	2,421
Recurring | Commodity contracts
Assets:
Unrealized gains on derivative contracts	964	1,359
Liabilities:
Unrealized losses on derivative contracts	926	957
Recurring | Foreign currency contracts
Assets:
Unrealized gains on derivative contracts	167	187
Liabilities:
Unrealized losses on derivative contracts	222	144
Recurring | Interest rate contracts
Assets:
Unrealized gains on derivative contracts	28
Recurring | Level 1
Assets:
Inventories carried at market	0	0
Cash equivalents	218	209
Segregated investments	1,595	1,362
Total Assets	1,813	1,571
Liabilities:
Inventory-related payables	0	0
Total Liabilities	0	0
Recurring | Level 1 | Commodity contracts
Assets:
Unrealized gains on derivative contracts	0	0
Liabilities:
Unrealized losses on derivative contracts	0	0
Recurring | Level 1 | Foreign currency contracts
Assets:
Unrealized gains on derivative contracts	0	0
Liabilities:
Unrealized losses on derivative contracts	0	0
Recurring | Level 1 | Interest rate contracts
Assets:
Unrealized gains on derivative contracts	0
Recurring | Level 2
Assets:
Inventories carried at market	3,466	4,274
Cash equivalents	0	0
Segregated investments	0	0
Total Assets	4,149	5,089
Liabilities:
Inventory-related payables	774	1,219
Total Liabilities	1,448	1,863
Recurring | Level 2 | Commodity contracts
Assets:
Unrealized gains on derivative contracts	488	628
Liabilities:
Unrealized losses on derivative contracts	452	500
Recurring | Level 2 | Foreign currency contracts
Assets:
Unrealized gains on derivative contracts	167	187
Liabilities:
Unrealized losses on derivative contracts	222	144
Recurring | Level 2 | Interest rate contracts
Assets:
Unrealized gains on derivative contracts	28
Recurring | Level 3
Assets:
Inventories carried at market	2,628	2,713
Cash equivalents	0	0
Segregated investments	0	0
Total Assets	3,104	3,444
Liabilities:
Inventory-related payables	27	101
Total Liabilities	501	558
Recurring | Level 3 | Commodity contracts
Assets:
Unrealized gains on derivative contracts	476	731
Liabilities:
Unrealized losses on derivative contracts	474	457
Recurring | Level 3 | Foreign currency contracts
Assets:
Unrealized gains on derivative contracts	0	0
Liabilities:
Unrealized losses on derivative contracts	0	$ 0
Recurring | Level 3 | Interest rate contracts
Assets:
Unrealized gains on derivative contracts	$ 0