Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 1,434	$ 1,184
Depreciation and amortization	277	259
Stock-based compensation expense	92	75
Other items, net	(38)	67
Changes in operating assets and liabilities, net of acquisitions:
Trade receivables, net	19	(92)
Inventories	(12)	(16)
Other assets	(10)	(133)
Accounts payable	35	226
Accrued income taxes	(406)	(60)
Other liabilities	(342)	(538)
Net cash provided by operating activities	1,049	972
Cash flows from investing activities:
Purchases of property, plant and equipment	(158)	(144)
Cash paid for acquisitions, net of cash acquired	0	(969)
Purchases of marketable securities	(6,964)	(6,133)
Proceeds from sales of marketable securities	6,013	4,740
Proceeds from maturities of marketable securities	2,924	160
Other	(6)	0
Net cash provided by (used in) investing activities	1,809	(2,346)
Cash flows from financing activities:
Repayment of debt	(2,500)	(84)
Repurchases of common stock	(832)	(1,375)
Dividends paid	(353)	(285)
Net proceeds from issuance of common stock in connection with the Company's equity award programs	93	374
Other	7	5
Net cash used in financing activities	(3,585)	(1,365)
Decrease in cash and cash equivalents	(727)	(2,739)
Cash and cash equivalents at beginning of period	3,257	6,946
Cash and cash equivalents at end of period	$ 2,530	$ 4,207