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)		1			0
Issuance of shares under employees' and directors' stock plans	67	$ 1	79		$ (13)
Stock-based compensation	33		33
Purchases of company common stock (in shares)					3
Purchases of company common stock	(500)				$ (500)
Dividends declared	(59)			(59)
Net Income	551			551
Other comprehensive items	163					163
Balance (in shares) at Apr. 01, 2017		416			25
Balance at Apr. 01, 2017	21,795	$ 416	12,252	14,419	$ (2,819)	(2,473)
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)		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)