Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	$ 7,722	$ 6,939	$ 5,158
Depreciation and amortization	2,105	2,108	2,092
Stock-based compensation expense	311	322	408
Deferred income taxes	183	(607)	(108)
Other items, net	32	(146)	56
Changes in operating assets and liabilities, net of acquisitions:
Trade receivables, net	(214)	(420)	136
Inventories	(80)	481	327
Other assets	(128)	155	(1)
Accounts payable	(44)	(12)	228
Accrued income taxes	(301)	509	(103)
Other liabilities	768	402	759
Net cash provided by operating activities	10,354	9,731	8,952
Cash flows from investing activities:
Purchases of property, plant and equipment	(738)	(594)	(718)
Cash paid for acquisitions, net of cash acquired	0	(359)	(165)
Purchases of intangible assets	(99)	(55)	(285)
Purchases of marketable securities	(28,094)	(25,977)	(25,878)
Proceeds from sales of marketable securities	17,958	18,029	16,697
Proceeds from maturities of marketable securities	2,459	3,527	4,199
Proceeds from sale of property, plant and equipment	78	274	3
Change in restricted investments, net	0	0	533
Other	(222)	(392)	(138)
Net cash used in investing activities	(8,658)	(5,547)	(5,752)
Cash flows from financing activities:
Net proceeds from issuance of debt	7,318	3,465	4,476
Repayment of debt	(3,725)	(2,400)	(5,605)
Repurchases of common stock	(2,965)	(1,867)	(138)
Dividends paid	(2,998)	(2,396)	(1,851)
Net proceeds from issuance of common stock in connection with the Company’s equity award programs	55	82	186
Settlement of contingent consideration obligations	0	(253)	(92)
Withholding taxes arising from shares withheld for share-based payments	(260)	(401)	(225)
Other	(24)	(1)	(25)
Net cash used in financing activities	(2,599)	(3,771)	(3,274)
(Decrease) increase in cash and cash equivalents	(903)	413	(74)
Cash and cash equivalents at beginning of period	4,144	3,731	3,805
Cash and cash equivalents at end of period	$ 3,241	$ 4,144	$ 3,731