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Fair Value Measurements Footnote (details) - Financial Instruments (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financial Instruments
Short-term securities	$ 3,483	$ 3,594
Fair Value [Member]
Financial Instruments
Short-term securities	3,483	3,594
Debt	7,715	7,583
Commercial paper	100	100
Fair Value [Member] \| Level 1 [Member]
Financial Instruments
Short-term securities	1,448	2,472
Fair Value [Member] \| Level 2 [Member]
Financial Instruments
Short-term securities	1,957	1,029
Debt	7,715	7,583
Commercial paper	100	100
Fair Value [Member] \| Level 3 [Member]
Financial Instruments
Short-term securities	78	93
Carrying Value [Member]
Financial Instruments
Short-term securities	3,483	3,594
Debt	6,250	6,505
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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