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Fair Value Measurements Footnote (details) - Financial Instruments (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financial Instruments
Short-term securities	$ 4,364us-gaap_OtherShortTermInvestments	$ 3,882us-gaap_OtherShortTermInvestments
Commercial paper amount	100us-gaap_CommercialPaper	100us-gaap_CommercialPaper
Fair Value [Member]
Financial Instruments
Short-term securities	4,364	3,882
Debt	7,522	7,123
Commercial paper amount	100	100
Fair Value [Member] \| Level 1 [Member]
Financial Instruments
Short-term securities	1,283	1,608
Fair Value [Member] \| Level 2 [Member]
Financial Instruments
Short-term securities	3,042	2,215
Debt	7,522	7,123
Commercial paper amount	100	100
Fair Value [Member] \| Level 3 [Member]
Financial Instruments
Short-term securities	39	59
Carrying Value [Member]
Financial Instruments
Short-term securities	4,364	3,882
Debt	6,249	6,246
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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