Consolidated Statement of Shareholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Items [Member]
Balance (in shares) at Dec. 31, 2018			432				29
Balance at Dec. 31, 2018	$ 27,586	$ 4	$ 432	$ 14,621	$ 18,696	$ 4	$ (3,665)	$ (2,498)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under employees' and directors' stock plans (in shares)			2				1
Issuance of shares under employees' and directors' stock plans	136		$ 2	205			$ (71)
Stock-based compensation	138			138
Purchases of company common stock (in shares)							3
Purchases of company common stock	(750)						$ (750)
Dividends declared	(229)				(229)
Net income	2,694				2,694
Other comprehensive items	(224)							(224)
Balance (in shares) at Sep. 28, 2019			434				33
Balance at Sep. 28, 2019	29,355		$ 434	14,964	21,165		$ (4,486)	(2,722)
Balance (in shares) at Jun. 29, 2019			433				33
Balance at Jun. 29, 2019	28,729		$ 433	14,887	20,482		$ (4,443)	(2,630)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under employees' and directors' stock plans (in shares)			1
Issuance of shares under employees' and directors' stock plans	(7)		$ 1	35			$ (43)
Stock-based compensation	42			42
Dividends declared	(77)				(77)
Net income	760				760
Other comprehensive items	(92)							(92)
Balance (in shares) at Sep. 28, 2019			434				33
Balance at Sep. 28, 2019	29,355		$ 434	14,964	21,165		$ (4,486)	(2,722)
Balance (in shares) at Dec. 31, 2019			434				36
Balance at Dec. 31, 2019	29,675	$ (1)	$ 434	15,064	22,092	$ (1)	$ (5,236)	(2,679)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under employees' and directors' stock plans (in shares)			3				0
Issuance of shares under employees' and directors' stock plans	182		$ 3	258			$ (79)
Stock-based compensation	145			145
Purchases of company common stock (in shares)							4
Purchases of company common stock	(1,500)						$ (1,500)
Dividends declared	(263)				(263)
Net income	3,877				3,877
Other comprehensive items	(291)							(291)
Balance (in shares) at Sep. 26, 2020			437				40
Balance at Sep. 26, 2020	31,824		$ 437	15,467	25,705		$ (6,815)	(2,970)
Balance (in shares) at Jun. 27, 2020			436				40
Balance at Jun. 27, 2020	29,875		$ 436	15,334	23,860		$ (6,766)	(2,989)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under employees' and directors' stock plans (in shares)			1				0
Issuance of shares under employees' and directors' stock plans	33		$ 1	81			$ (49)
Stock-based compensation	52			52
Dividends declared	(88)				(88)
Net income	1,933				1,933
Other comprehensive items	19							19
Balance (in shares) at Sep. 26, 2020			437				40
Balance at Sep. 26, 2020	$ 31,824		$ 437	$ 15,467	$ 25,705		$ (6,815)	$ (2,970)