Fair Value Measurements - Assets and Liabilities Accounted for at Fair Value on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Assets:
Inventories carried at market	$ 6,584	$ 6,222
Cash equivalents	192	280
Marketable securities	33	32
Segregated investments and restricted cash equivalents	2,592	1,771
Total Assets	10,614	9,252
Liabilities:
Inventory-related payables	907	730
Total Liabilities	2,041	1,487
Commodity contracts
Assets:
Unrealized gains on derivative contracts	941	822
Liabilities:
Unrealized losses on derivative contracts	989	613
Foreign currency contracts
Assets:
Unrealized gains on derivative contracts	266	108
Liabilities:
Unrealized losses on derivative contracts	145	144
Interest rate contracts
Assets:
Unrealized gains on derivative contracts	6	17
Level 1
Assets:
Inventories carried at market	0	0
Cash equivalents	192	280
Marketable securities	33	32
Segregated investments and restricted cash equivalents	2,592	1,771
Total Assets	2,817	2,083
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	3,222	3,549
Cash equivalents	0	0
Marketable securities	0	0
Segregated investments and restricted cash equivalents	0	0
Total Assets	3,837	3,984
Liabilities:
Inventory-related payables	867	714
Total Liabilities	1,513	1,158
Level 2 | Commodity contracts
Assets:
Unrealized gains on derivative contracts	343	310
Liabilities:
Unrealized losses on derivative contracts	501	300
Level 2 | Foreign currency contracts
Assets:
Unrealized gains on derivative contracts	266	108
Liabilities:
Unrealized losses on derivative contracts	145	144
Level 2 | Interest rate contracts
Assets:
Unrealized gains on derivative contracts	6	17
Level 3
Assets:
Inventories carried at market	3,362	2,673
Cash equivalents	0	0
Marketable securities	0	0
Segregated investments and restricted cash equivalents	0	0
Total Assets	3,960	3,185
Liabilities:
Inventory-related payables	40	16
Total Liabilities	528	329
Level 3 | Commodity contracts
Assets:
Unrealized gains on derivative contracts	598	512
Liabilities:
Unrealized losses on derivative contracts	488	313
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