Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net income		$ 3,682	$ 3,595	$ 2,986
Adjustments to Net income:
Depreciation		539	605	766
Amortization of acquisition-related intangibles		318	319	319
Amortization of capitalized software		47	31	48
Stock compensation		242	252	286
Gains on sales of assets		0	(40)	(85)
Deferred taxes		112	(202)	(55)
Increase (decrease) from changes in:
Accounts receivable		(7)	(108)	77
Inventories		(167)	(99)	93
Prepaid expenses and other current assets		76	(81)	94
Accounts payable and accrued expenses		51	72	(142)
Accrued compensation		(3)	36	7
Income taxes payable		468	333	11
Changes in funded status of retirement plans		21	(73)	(23)
Other		(16)	(26)	15
Cash flows from operating activities		5,363	4,614	4,397
Cash flows from investing activities
Capital expenditures		(695)	(531)	(551)
Proceeds from asset sales		40	0	110
Purchases of short-term investments		(4,555)	(3,503)	(2,767)
Proceeds from short-term investments		4,095	3,390	2,892
Other		(12)	(6)	14
Cash flows from investing activities		(1,127)	(650)	(302)
Cash flows from financing activities
Proceeds from issuance of long-term debt		1,099	499	498
Repayment of debt		(625)	(1,000)	(1,000)
Dividends paid		(2,104)	(1,646)	(1,444)
Stock repurchases		(2,556)	(2,132)	(2,741)
Proceeds from common stock transactions	[1]	483	472	396
Other		(31)	(3)	(3)
Cash flows from financing activities		(3,734)	(3,810)	(4,294)
Net change in Cash and cash equivalents		502	154	(199)
Cash and cash equivalents at beginning of period		1,154	1,000	1,199
Cash and cash equivalents at end of period		$ 1,656	$ 1,154	$ 1,000

[1] Net of taxes paid for employee shares withheld of $83 million in 2017, $70 million in 2016 and $46 million in 2015.