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		$ 3,595	$ 2,986	$ 2,821
Adjustments to Net income:
Depreciation		605	766	850
Amortization of acquisition-related intangibles		319	319	321
Amortization of capitalized software		31	48	59
Stock compensation		252	286	277
Gains on sales of assets		(40)	(85)	(73)
Deferred income taxes		(202)	(55)	(61)
Increase (decrease) from changes in:
Accounts receivable		(108)	77	(49)
Inventories		(99)	93	(53)
Prepaid expenses and other current assets		(81)	94	65
Accounts payable and accrued expenses		72	(142)	(132)
Accrued compensation		36	7	89
Income taxes payable		333	11	(81)
Changes in funded status of retirement plans		(73)	(23)	(58)
Other		(26)	15	79
Cash flows from operating activities		4,614	4,397	4,054
Cash flows from investing activities
Capital expenditures		(531)	(551)	(385)
Proceeds from asset sales		0	110	142
Purchases of short-term investments		(3,503)	(2,767)	(3,107)
Proceeds from short-term investments		3,390	2,892	2,966
Other		(6)	14	7
Cash flows from investing activities		(650)	(302)	(377)
Cash flows from financing activities
Proceeds from issuance of long-term debt		499	498	498
Repayment of debt		(1,000)	(1,000)	(1,000)
Dividends paid		(1,646)	(1,444)	(1,323)
Stock repurchases		(2,132)	(2,741)	(2,831)
Proceeds from common stock transactions	[1]	472	396	554
Other		(3)	(3)	(3)
Cash flows from financing activities		(3,810)	(4,294)	(4,105)
Net change in Cash and cash equivalents		154	(199)	(428)
Cash and cash equivalents at beginning of period		1,000	1,199	1,627
Cash and cash equivalents at end of period		$ 1,154	$ 1,000	$ 1,199

[1] Net of taxes paid for employee shares withheld of $70 million in 2016, $46 million in 2015 and $62 million in 2014.