Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net income		$ 5,595	$ 5,017	$ 5,580
Adjustments to net income:
Depreciation		733	708	590
Amortization of acquisition-related intangibles		198	288	318
Amortization of capitalized software		61	54	46
Stock compensation		224	217	232
Gains on sales of assets		(4)	(23)	(3)
Deferred taxes		(137)	81	(105)
Increase (decrease) from changes in:
Accounts receivable		(340)	133	71
Inventories		46	216	(282)
Prepaid expenses and other current assets		(79)	265	669
Accounts payable and accrued expenses		63	(93)	(7)
Accrued compensation		63	(15)	(7)
Income taxes payable		(181)	(193)	158
Changes in funded status of retirement plans		(9)	29	36
Other		(94)	(35)	(107)
Cash flows from operating activities		6,139	6,649	7,189
Cash flows from investing activities
Capital expenditures		(649)	(847)	(1,131)
Proceeds from asset sales		4	30	9
Purchases of short-term investments		(5,786)	(3,444)	(5,641)
Proceeds from short-term investments		5,545	2,309	6,708
Other		(36)	32	(23)
Cash flows from investing activities		(922)	(1,920)	(78)
Cash flows from financing activities
Proceeds from issuance of long-term debt		1,498	1,491	1,500
Repayment of debt		(500)	(750)	(500)
Dividends paid		(3,426)	(3,008)	(2,555)
Stock repurchases		(2,553)	(2,960)	(5,100)
Proceeds from common stock transactions	[1]	470	539	373
Other		(36)	(42)	(47)
Cash flows from financing activities		(4,547)	(4,730)	(6,329)
Net change in cash and cash equivalents		670	(1)	782
Cash and cash equivalents at beginning of period		2,437	2,438	1,656
Cash and cash equivalents at end of period		$ 3,107	$ 2,437	$ 2,438

[1] Net of taxes paid for employee shares withheld of $53 million, $52 million and $60 million in 2020, 2019 and 2018, respectively.