Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities
Net income	$ 2,986	$ 2,821	$ 2,162
Adjustments to Net income:
Depreciation	766	850	879
Amortization of acquisition-related intangibles	319	321	336
Amortization of capitalized software	48	59	82
Stock-based compensation	286	277	287
Gains on sales of assets	(85)	(73)	(6)
Deferred income taxes	(55)	(61)	50
Increase (decrease) from changes in:
Accounts receivable	77	(49)	16
Inventories	93	(53)	26
Prepaid expenses and other current assets	94	65	(136)
Accounts payable and accrued expenses	(188)	(194)	(284)
Accrued compensation	7	89	18
Income taxes payable	11	(81)	78
Changes in funded status of retirement plans	(23)	(58)	28
Other	(68)	(21)	(152)
Cash flows from operating activities	4,268	3,892	3,384
Cash flows from investing activities
Capital expenditures	(551)	(385)	(412)
Proceeds from asset sales	110	142	21
Purchases of short-term investments	(2,767)	(3,107)	(3,907)
Proceeds from short-term investments	2,892	2,966	4,249
Other	14	7	46
Cash flows from investing activities	(302)	(377)	(3)
Cash flows from financing activities
Proceeds from issuance of long-term debt	498	498	986
Repayment of debt	(1,000)	(1,000)	(1,500)
Dividends paid	(1,444)	(1,323)	(1,175)
Stock repurchases	(2,741)	(2,831)	(2,868)
Proceeds from common stock transactions	442	616	1,314
Excess tax benefit from share-based payments	83	100	80
Other	(3)	(3)	(7)
Cash flows from financing activities	(4,165)	(3,943)	(3,170)
Net change in Cash and cash equivalents	(199)	(428)	211
Cash and cash equivalents at beginning of period	1,199	1,627	1,416
Cash and cash equivalents at end of period	$ 1,000	$ 1,199	$ 1,627