Fair Value Measurements (Fair Value Measurements At Reporting Date) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets:
Marketable securities	$ 1,000us-gaap_AvailableForSaleSecurities	$ 941us-gaap_AvailableForSaleSecurities
Deferred receivables consideration	511adm_Deferredreceivablesconsideration	757adm_Deferredreceivablesconsideration
Fair Value, Measurements, Recurring [Member]
Assets:
Inventories carried at market	4,699	6,059
Cash Equivalents	491	2,518
Marketable securities	940	907
Segregated investments	2,158	1,707
Deferred receivables consideration		757
Total Assets	9,696	12,917
Liabilities:
Inventory-related payables	652	742
Total Liabilities	1,578	1,566
Fair Value, Measurements, Recurring [Member] \| Commodity Contracts [Member]
Assets:
Derivative Asset	690	850
Liabilities:
Derivative Liability	776	649
Fair Value, Measurements, Recurring [Member] \| Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	186	118
Liabilities:
Derivative Liability	150	166
Fair Value, Measurements, Recurring [Member] \| Interest Rate Contracts [Member]
Assets:
Derivative Asset	21	1
Liabilities:
Derivative Liability		9
Fair Value, Measurements, Recurring [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Assets:
Inventories carried at market	0	0
Cash Equivalents	491	2,518
Marketable securities	860	881
Segregated investments	2,158	1,707
Deferred receivables consideration	0	0
Total Assets	3,509	5,167
Liabilities:
Inventory-related payables	0	0
Total Liabilities	0	45
Fair Value, Measurements, Recurring [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] \| Commodity Contracts [Member]
Assets:
Derivative Asset	0	31
Liabilities:
Derivative Liability	0	45
Fair Value, Measurements, Recurring [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] \| Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	0	30
Liabilities:
Derivative Liability	0	0
Fair Value, Measurements, Recurring [Member] \| Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] \| Interest Rate Contracts [Member]
Assets:
Derivative Asset	0
Liabilities:
Derivative Liability		0
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Assets:
Inventories carried at market	3,208	4,247
Marketable securities	80	26
Deferred receivables consideration	511	757
Total Assets	4,493	5,659
Liabilities:
Inventory-related payables	612	708
Total Liabilities	1,326	1,226
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Commodity Contracts [Member]
Assets:
Derivative Asset	487	540
Liabilities:
Derivative Liability	564	343
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	186	88
Liabilities:
Derivative Liability	150	166
Fair Value, Measurements, Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Interest Rate Contracts [Member]
Assets:
Derivative Asset	21	1
Liabilities:
Derivative Liability		9
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Assets:
Inventories carried at market	1,491	1,812
Marketable securities	0	0
Deferred receivables consideration	0	0
Total Assets	1,694	2,091
Liabilities:
Inventory-related payables	40	34
Total Liabilities	252	295
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Commodity Contracts [Member]
Assets:
Derivative Asset	203	279
Liabilities:
Derivative Liability	212	261
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Foreign Exchange Contracts [Member]
Assets:
Derivative Asset	0	0
Liabilities:
Derivative Liability	0	0
Fair Value, Measurements, Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Interest Rate Contracts [Member]
Assets:
Derivative Asset	0
Liabilities:
Derivative Liability		$ 0

Deferred consideration related to the Company's accounts receivable securitization program.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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The aggregate value of all restricted investments.

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