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, 2016		415			22
Balance at Dec. 31, 2016	$ 21,540	$ 415	$ 12,140	$ 13,927	$ (2,306)	$ (2,636)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under employees' and directors' stock plans (in shares)		2			0
Issuance of shares under employees' and directors' stock plans	108	$ 2	120		$ (14)
Stock-based compensation	71		71
Purchases of company common stock (in shares)					5
Purchases of company common stock	(750)				$ (750)
Dividends declared	(118)			(118)
Net Income	1,163			1,163
Other comprehensive items	380					380
Other	(3)		(3)
Balance (in shares) at Jul. 01, 2017		417			27
Balance at Jul. 01, 2017	22,391	$ 417	12,328	14,972	$ (3,070)	(2,256)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting changes	30			118		(88)
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]
Issuance of shares under employees' and directors' stock plans (in shares)		2			0
Issuance of shares under employees' and directors' stock plans	90	$ 2	113		$ (25)
Stock-based compensation	91		91
Dividends declared	(137)			(137)
Net Income	1,331			1,331
Other comprehensive items	(400)					(400)
Other	27		27
Balance (in shares) at Jun. 30, 2018		430			27
Balance at Jun. 30, 2018	$ 26,445	$ 430	$ 14,408	$ 17,226	$ (3,128)	$ (2,491)