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Fair Value Measurements Footnote (details) - Financial Instruments (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financial Instruments
Short-term securities	$ 4,490us-gaap_OtherShortTermInvestments	$ 4,364us-gaap_OtherShortTermInvestments
Fair Value [Member]
Financial Instruments
Short-term securities	4,490	4,364
Debt	7,654	7,522
Commercial paper amount	100	100
Fair Value [Member] \| Level 1 [Member]
Financial Instruments
Short-term securities	1,238	1,283
Fair Value [Member] \| Level 2 [Member]
Financial Instruments
Short-term securities	3,215	3,042
Debt	7,654	7,522
Commercial paper amount	100	100
Fair Value [Member] \| Level 3 [Member]
Financial Instruments
Short-term securities	37	39
Carrying Value [Member]
Financial Instruments
Short-term securities	4,490	4,364
Debt	6,249	6,249
Commercial paper amount	$ 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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