Fair Value Measurements (Fair Value Measurements At Reporting Date) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets:
Unrealized derivative gains	$ 969	$ 1,381
Cash Equivalents	2,518	1,045
Deferred consideration	757	900
Liabilities:
Unrealized derivative losses	824	1,054
Fair Value, Measurements, Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Assets:
Marketable securities	881	1,265
Segregated investments	1,707	1,186
Total Assets	5,167	3,627
Liabilities:
Total Liabilities	45	63
Fair Value, Measurements, Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Commodity Contracts [Member]
Assets:
Unrealized derivative gains	31	131
Liabilities:
Unrealized derivative losses	45	63
Fair Value, Measurements, Recurring [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Foreign Exchange Contracts [Member]
Assets:
Unrealized derivative gains	30
Liabilities:
Unrealized derivative losses		0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Inventories carried at market	4,247	5,291
Marketable securities	26	16
Deferred consideration	757	900
Total Assets	5,659	7,314
Liabilities:
Inventory-related payables	708	903
Total Liabilities	1,226	1,756
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commodity Contracts [Member]
Assets:
Unrealized derivative gains	540	936
Liabilities:
Unrealized derivative losses	343	638
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Contracts [Member]
Assets:
Unrealized derivative gains	88	170
Liabilities:
Unrealized derivative losses	166	215
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Contracts [Member]
Assets:
Unrealized derivative gains		1
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contracts [Member]
Assets:
Unrealized derivative gains	1
Liabilities:
Unrealized derivative losses	9
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Inventories carried at market	1,812	1,745
Total Assets	2,091	1,888
Liabilities:
Inventory-related payables	34	33
Total Liabilities	295	171
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commodity Contracts [Member]
Assets:
Unrealized derivative gains	279	143
Liabilities:
Unrealized derivative losses	261	138
Fair Value, Measurements, Recurring [Member] | Total Fair Value [Member]
Assets:
Inventories carried at market	6,059	7,036
Marketable securities	907	1,281
Segregated investments	1,707	1,186
Deferred consideration	757	900
Total Assets	12,917	12,829
Liabilities:
Inventory-related payables	742	936
Total Liabilities	1,566	1,990
Fair Value, Measurements, Recurring [Member] | Total Fair Value [Member] | Commodity Contracts [Member]
Assets:
Unrealized derivative gains	850	1,210
Liabilities:
Unrealized derivative losses	649	839
Fair Value, Measurements, Recurring [Member] | Total Fair Value [Member] | Foreign Exchange Contracts [Member]
Assets:
Unrealized derivative gains	118	170
Liabilities:
Unrealized derivative losses	166	215
Fair Value, Measurements, Recurring [Member] | Total Fair Value [Member] | Other Contracts [Member]
Assets:
Unrealized derivative gains		1
Fair Value, Measurements, Recurring [Member] | Total Fair Value [Member] | Interest Rate Contracts [Member]
Assets:
Unrealized derivative gains	1
Liabilities:
Unrealized derivative losses	$ 9