Earnings Per Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share (Details) [Abstract]
Income from continuing operations less net income attributable to the noncontrolling interest	$ 685	$ 579	$ 2,168	$ 1,600
Net income from discontinued operations after taxes	177	19	209	53
Net income attributable to Honeywell	862	598	2,377	1,653
Weighted average number of common shares outstanding	778.2	776.5	782.9	770.6
Earnings per share continuing operations - basic:	$ 0.88	$ 0.75	$ 2.77	$ 2.08
Earnings per share discontinued operations - basic:	$ 0.23	$ 0.02	$ 0.27	$ 0.07
Earnings per share of common stock	$ 1.11	$ 0.77	$ 3.04	$ 2.15
Assuming dilution
Income from continuing operations less net income attributable to the noncontrolling interest	685	579	2,168	1,600
Net income from discontinued operations after taxes	177	19	209	53
Net income attributable to Honeywell	$ 862	$ 598	$ 2,377	$ 1,653
Average shares
Weighted average number of common shares outstanding	778.2	776.5	782.9	770.6
Dilutive securities issuable in connection with stock plans	8.7	6.3	11.1	6.7
Total weighted average number of common shares outstanding	786.9	782.8	794.0	777.3
Earnings per share continuing operations - assuming dilution:	$ 0.87	$ 0.74	$ 2.73	$ 2.06
Earnings per share discontinued operations - assuming dilution:	$ 0.23	$ 0.02	$ 0.26	$ 0.07
Earnings per share of common stock	$ 1.10	$ 0.76	$ 2.99	$ 2.13
Earnings Per Share Paragraph Details [Abstract]
Stock options excluded from diluted computations	11.6	8.9	21.7	18.3