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Objectives and Strategies for Using Derivatives (Classified by Risk) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Assets	$ 61	$ 70
Liabilities	120	48
Foreign Exchange Contract [Member]
Assets	45	46
Liabilities	33	39
Interest Rate Contract [Member]
Assets	16	24
Liabilities	75	2
Commodity Contract [Member]
Assets	0	0
Liabilities	$ 12	$ 7

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details