Consolidated Statement of Shareholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Items [Member]
Balance (in shares) at Dec. 31, 2017		428			27
Balance at Dec. 31, 2017	$ 25,413	$ 428	$ 14,177	$ 15,914	$ (3,103)	$ (2,003)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting changes	30			118		(88)
Issuance of shares under employees' and directors' stock plans (in shares)		1			0
Issuance of shares under employees' and directors' stock plans	51	$ 1	72		$ (22)
Stock-based compensation	43		43
Dividends declared	(69)			(69)
Net Income	579			579
Other comprehensive items	49					49
Other	27		27
Balance (in shares) at Mar. 31, 2018		429			27
Balance at Mar. 31, 2018	26,123	$ 429	14,319	16,542	$ (3,125)	(2,042)
Balance (in shares) at Dec. 31, 2018		432			29
Balance at Dec. 31, 2018	27,586	$ 432	14,621	18,696	$ (3,665)	(2,498)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting changes	4			4		0
Issuance of shares under employees' and directors' stock plans (in shares)		1			1
Issuance of shares under employees' and directors' stock plans	81	$ 1	106		$ (26)
Stock-based compensation	44		44
Purchases of company common stock (in shares)					3
Purchases of company common stock	(750)				$ (750)
Dividends declared	(76)			(76)
Net Income	815			815
Other comprehensive items	(11)					(11)
Balance (in shares) at Mar. 30, 2019		433			33
Balance at Mar. 30, 2019	$ 27,693	$ 433	$ 14,771	$ 19,439	$ (4,441)	$ (2,509)