Earnings Per Share (Details) (USD $) In Millions, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Earnings Per Share (Details) [Abstract]
Income from continuing operations less net income attributable to the noncontrolling interest	$ 796	$ 550	$ 1,483	$ 1,021
Net income from discontinued operations after taxes	14	16	32	34
Net income attributable to Honeywell	810	566	1,515	1,055
Weighted average number of common shares outstanding	785.0	769.6	785.2	767.7
Earnings per share continuing operations - basic:	$ 1.01	$ 0.72	$ 1.89	$ 1.33
Earnings per share discontinued operations - basic:	$ 0.02	$ 0.02	$ 0.04	$ 0.04
Earnings per share of common stock	$ 1.03	$ 0.74	$ 1.93	$ 1.37
Assuming dilution
Income from continuing operations less net income attributable to the noncontrolling interest	796	550	1,483	1,021
Net income from discontinued operations after taxes	14	16	32	34
Net income attributable to Honeywell	$ 810	$ 566	$ 1,515	$ 1,055
Average shares
Weighted average number of common shares outstanding	785.0	769.6	785.2	767.7
Dilutive securities issuable in connection with stock plans	12.3	7.7	12.3	6.8
Total weighted average number of common shares outstanding	797.3	777.3	797.5	774.5
Earnings per share continuing operations - assuming dilution:	$ 1.00	$ 0.71	$ 1.86	$ 1.32
Earnings per share discontinued operations - assuming dilution:	$ 0.02	$ 0.02	$ 0.04	$ 0.04
Earnings per share of common stock	$ 1.02	$ 0.73	$ 1.90	$ 1.36
Earnings Per Share Paragraph Details [Abstract]
Stock options excluded from diluted computations	7.9	14.8	7.5	16.6

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income or loss for the period per each share of common stock outstanding during the reporting period.

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-Publisher SEC
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The amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period.

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This element represents the income or loss from continuing operations attributable to the reporting entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items and cumulative effects of changes in accounting principles, but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests, if any.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29

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-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph b(1)

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The amount of income (loss) from continuing operations per each share of common stock outstanding during the reporting period.

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The amount of income (loss) from continuing operations available to each share of common stock outstanding during the reporting period and each share that would have been outstanding assuming the issuance of common shares for all dilutive potential common shares outstanding during the reporting period.

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This element represents the overall income (loss) from a disposal group apportioned to the parent that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items and the cumulative effect of accounting changes after deduction or consideration of the amount which may be allocable to noncontrolling interests, if any. Includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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The amount of income (loss) from disposition of discontinued operations, net of related tax effect, per each share of common stock outstanding during the reporting period.

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The amount of income (loss) from discontinued operations, net of related tax effect, per each diluted share of common stock outstanding during the reporting period.

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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section E
-Paragraph Question 3

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Aggregate awards of share options and nonvested shares to be issued to an employee under a share-based compensation arrangement are considered options for purposes of computing diluted earnings per share. Such share-based awards shall be considered to be outstanding as of the grant date for purposes of computing diluted earnings per share even though their exercise may be contingent upon vesting. Those share-based awards are included in the diluted Earnings Per Share (EPS) computation even if the employee may not receive (or be able to sell) the stock until some future date. Accordingly, all shares to be issued shall be included in computing diluted EPS if the effect is dilutive. The dilutive effect of share-based compensation arrangements shall be computed using the treasury stock method. If the equity share options or other equity instruments are outstanding for only part of a period, the shares issuable shall be weighted to reflect the portion of the period during which the equity instruments were outstanding.

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The portion of consolidated profit or loss for the period, net of income taxes, which is attributable to the parent. If the entity does not present consolidated financial statements, the amount of profit or loss for the period, net of income taxes.

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The average number of shares issued and outstanding that are used in calculating diluted EPS, determined based on the timing of issuance of shares in the period.

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This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic).

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