Consolidated statements of cash flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 362	$ 265
Adjustments to net income:
Depreciation	228	243
Amortization of acquisition-related intangibles	85	86
Stock-based compensation	75	69
(Gains) losses on sales of assets	(3)	0
Deferred income taxes	15	(4)
Increase (decrease) from changes in:
Accounts receivable	(112)	63
Inventories	57	(91)
Prepaid expenses and other current assets	21	5
Accounts payable and accrued expenses	(244)	(37)
Accrued compensation	(154)	(211)
Income taxes payable	29	67
Changes in funded status of retirement plans	29	26
Other	(28)	(32)
Cash flows from operating activities	360	449
Cash flows from investing activities:
Capital expenditures	(84)	(103)
Proceeds from asset sales	18	0
Purchases of short-term investments	(536)	(242)
Proceeds from short-term investments	615	613
Purchases of long-term investments	0	(1)
Proceeds from long-term investments	9	3
Cash flows from investing activities	22	270
Cash flows from financing activities:
Repayment of commercial paper borrowings	0	(300)
Dividends paid	(232)	(195)
Stock repurchases	(679)	(300)
Proceeds from common stock transactions	454	259
Excess tax benefit from share-based payments	52	18
Cash flows from financing activities	(405)	(518)
Net change in cash and cash equivalents	(23)	201
Cash and cash equivalents, beginning of period	1,416	992
Cash and cash equivalents, end of period	$ 1,393	$ 1,193