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Reclassification adjustment for unrealized gains or losses realized upon the sale of securities, after tax.

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Financial Instruments (excluding derivatives) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011 country Y	Sep. 30, 2010	Sep. 30, 2011 Y basispoint entity country	Sep. 30, 2010	Dec. 31, 2010
Fair value of financial instruments, details:
Carrying amount of long-term debt	$ 24,089		$ 24,089		$ 21,846
Fair value of long-term debt	26,592		26,592		24,006
Debt and Marketable Equity Securities.
Cash and cash equivalents, Adjusted Cost	7,864		7,864		7,801
Cash and cash equivalents, gross unrealized gains					0
Cash and cash equivalents, gross unrealized losses	0		0		0
Debt securities - current, Adjusted Cost					990
Debt securities - current, gross unrealized losses					0
Debt securities - noncurrent, Adjusted Cost	7		7		6
Debt securities non-current gross unrealized gains	1		1		1
Debt securities non-current gross unrealized losses					0
Available-for-sale equity investments, Adjusted Cost	57		57		194
Available-for-sale equity investments, gross unrealized gains	19		19		264
Available-for-sale equity investments, gross unrealized losses	(2)		(2)		0
Cash and cash equivalents	7,864		7,864		7,801
Debt securities - current					990
Debt securities - noncurrent	8		8		7
Available-for-sale equity investments	74		74		458
Proceeds from sales of debt securities and marketable equity securities		1	402	14
Gross realized gains (before taxes) on sales of debt securities and marketable equity securities		1	232	5
Gross realized losses (before taxes) on sales of debt securities and marketable equity securities		1	1	1
Unrealized holding gains (losses) on available-for-sale debt and marketable securities
Net unrealized gains/(losses) arising during the period	(9)	56	(12)	50
Net unrealized (gains)/losses reclassified to net income	0	0	(142)	0
Writedowns included in net income for the period	0.2	0.5	0.2	3.6
Contractual maturities of substantially all available-for-sale debt securities	1		1
Time deposits and certificates of deposit
Debt and Marketable Equity Securities.
Cash and cash equivalents, Adjusted Cost	3,602		3,602		2,473
Cash and cash equivalents, gross unrealized losses	0		0		0
Cash and cash equivalents	3,602		3,602		2,473
Commercial paper
Debt and Marketable Equity Securities.
Cash and cash equivalents, Adjusted Cost	2,794		2,794		2,673
Cash and cash equivalents, gross unrealized losses	0		0		0
Debt securities - current, Adjusted Cost					490
Debt securities - current, gross unrealized losses					0
Cash and cash equivalents	2,794		2,794		2,673
Debt securities - current					490
Money market funds
Debt and Marketable Equity Securities.
Cash and cash equivalents, Adjusted Cost	319		319		1,532
Cash and cash equivalents	319		319		1,532
Foreign government securities
Debt and Marketable Equity Securities.
Cash and cash equivalents, Adjusted Cost					1,054
Cash and cash equivalents					1,054
U.S. government securities
Debt and Marketable Equity Securities.
Cash and cash equivalents, Adjusted Cost	1,110		1,110		44
Cash and cash equivalents, gross unrealized gains					0
Cash and cash equivalents, gross unrealized losses					0
Debt securities - current, Adjusted Cost					500
Debt securities - current, gross unrealized losses					0
Cash and cash equivalents	1,110		1,110		44
Debt securities - current					500
U.S. government agency securities
Debt and Marketable Equity Securities.
Cash and cash equivalents, Adjusted Cost					22
Cash and cash equivalents, gross unrealized gains					0
Cash and cash equivalents, gross unrealized losses					0
Cash and cash equivalents					22
Other securities
Debt and Marketable Equity Securities.
Cash and cash equivalents, Adjusted Cost	40		40		3
Debt securities - current, Adjusted Cost					1
Debt securities - current, gross unrealized losses					0
Debt securities - noncurrent, Adjusted Cost	7		7		6
Debt securities non-current gross unrealized gains	1		1		1
Debt securities non-current gross unrealized losses					0
Cash and cash equivalents	40		40		3
Debt securities - current					1
Debt securities - noncurrent	$ 8		$ 8		$ 7