Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities
Net income		$ 5,580	$ 3,682	$ 3,595
Adjustments to net income:
Depreciation		590	539	605
Amortization of acquisition-related intangibles		318	318	319
Amortization of capitalized software		46	47	31
Stock compensation		232	242	252
Gains on sales of assets		(3)	0	(40)
Deferred taxes		(105)	112	(202)
Increase (decrease) from changes in:
Accounts receivable		71	(7)	(108)
Inventories		(282)	(167)	(99)
Prepaid expenses and other current assets		669	76	(81)
Accounts payable and accrued expenses		(7)	51	72
Accrued compensation		(7)	(3)	36
Income taxes payable		158	468	333
Changes in funded status of retirement plans		36	21	(73)
Other		(107)	(16)	(26)
Cash flows from operating activities		7,189	5,363	4,614
Cash flows from investing activities
Capital expenditures		(1,131)	(695)	(531)
Proceeds from asset sales		9	40	0
Purchases of short-term investments		(5,641)	(4,555)	(3,503)
Proceeds from short-term investments		6,708	4,095	3,390
Other		(23)	(12)	(6)
Cash flows from investing activities		(78)	(1,127)	(650)
Cash flows from financing activities
Proceeds from issuance of long-term debt		1,500	1,099	499
Repayment of debt		(500)	(625)	(1,000)
Dividends paid		(2,555)	(2,104)	(1,646)
Stock repurchases		(5,100)	(2,556)	(2,132)
Proceeds from common stock transactions	[1]	373	483	472
Other		(47)	(31)	(3)
Cash flows from financing activities		(6,329)	(3,734)	(3,810)
Net change in cash and cash equivalents		782	502	154
Cash and cash equivalents at beginning of period		1,656	1,154	1,000
Cash and cash equivalents at end of period		$ 2,438	$ 1,656	$ 1,154

[1] Net of taxes paid for employee shares withheld of $60 million, $83 million and $70 million in 2018, 2017 and 2016, respectively.