Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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+ Details

Derivative and Financial Instruments - Financial Instruments (Details 6) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Financial Instruments
Cash and cash equivalents	$ 3,909	$ 3,618	$ 1,044	$ 5,780
Short-term Investments	75
Cash [Member]
Financial Instruments
Cash and cash equivalents	757	829
Bank Time Deposits [Member]
Financial Instruments
Cash and cash equivalents	3,152	2,789
Short-term Investments	$ 75