Summary Of Significant Accounting Policies Summary Of Significant Accounting Policies (Schedule Of Inventories) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
LIFO inventories
FIFO value	$ 1,199adm_FIFOValueOfLIFOInventory	$ 1,408adm_FIFOValueOfLIFOInventory
LIFO valuation reserve	(53)us-gaap_InventoryLIFOReserve	(297)us-gaap_InventoryLIFOReserve
LIFO inventories carrying value	1,146us-gaap_LIFOInventoryAmount	1,111us-gaap_LIFOInventoryAmount
FIFO inventories	3,058us-gaap_FIFOInventoryAmount	3,741us-gaap_FIFOInventoryAmount
Market inventories	4,699adm_InventoriesAtMarketValue	6,059adm_InventoriesAtMarketValue
Supplies and other inventories	471us-gaap_InventorySuppliesNetOfReserves	530us-gaap_InventorySuppliesNetOfReserves
Total inventories	$ 9,374us-gaap_InventoryNet	$ 11,441us-gaap_InventoryNet

The FIFO value of inventories accounted using LIFO method.

No definition available.

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- Definition

The value of inventories measured at market value.

+ References

No definition available.

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- Definition

The amount of FIFO (first in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766

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- Definition

Amount of difference between inventory at lower of LIFO cost or market and inventory at lower of other inventory accounting method cost or market, for example, but not limited to, FIFO or average cost.

+ References

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- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.6(a))

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

-SubTopic 10

-Section 35

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-Section 45

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- Definition

Carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of products used directly or indirectly in the manufacturing or production process, which may or may not become part of the final product. May also include items used in the storage, presentation or transportation of physical goods.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SAB TOPIC 5.BB)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 6

-Article 5

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-Subparagraph (SX 210.5-02.6(a)(5))

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- Definition

The amount of LIFO (last in first out) inventory present at the reporting date when inventory is also valued using different valuation methods.

+ References

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