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Fair Value Measurements Footnote (details) - Financial Instruments (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financial Instruments
Short-term securities	$ 5,379	$ 3,483
Fair Value [Member]
Financial Instruments
Short-term securities	5,379	3,483
Debt	7,239	7,715
Commercial paper	100	100
Fair Value [Member] \| Level 1 [Member]
Financial Instruments
Short-term securities	1,995	1,448
Fair Value [Member] \| Level 2 [Member]
Financial Instruments
Short-term securities	3,323	1,957
Debt	7,239	7,715
Commercial paper	100	100
Fair Value [Member] \| Level 3 [Member]
Financial Instruments
Short-term securities	61	78
Carrying Value [Member]
Financial Instruments
Short-term securities	5,379	3,483
Debt	6,246	6,250
Commercial paper	$ 100	$ 100

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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- Definition

Other investments not otherwise specified in the taxonomy that will be realized in a short period of time, usually less than one year or the normal operating cycle, whichever is longer.

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