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PENSION AND OTHER POSTRETIREMENT BENEFITS - Fair Value of Pension Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Pension ongoing income—non-service | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | $ 16,594 | $ 17,005 | $ 20,560
Pension ongoing income—non-service | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 5,549 | 5,304 | 8,396
Honeywell common stock | Pension ongoing income—non-service | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 3,049 | 3,336 |
Honeywell common stock | Pension ongoing income—non-service | Level 1 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 3,049 | 3,336 |
Honeywell common stock | Pension ongoing income—non-service | Level 2 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Honeywell common stock | Pension ongoing income—non-service | Level 3 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
U.S. equities | Pension ongoing income—non-service | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 6 |
U.S. equities | Pension ongoing income—non-service | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 195 | 144 |
U.S. equities | Pension ongoing income—non-service | Level 1 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 6 |
U.S. equities | Pension ongoing income—non-service | Level 1 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 2 |
U.S. equities | Pension ongoing income—non-service | Level 2 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
U.S. equities | Pension ongoing income—non-service | Level 2 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 195 | 142 |
U.S. equities | Pension ongoing income—non-service | Level 3 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
U.S. equities | Pension ongoing income—non-service | Level 3 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Short-term investments | Pension ongoing income—non-service | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 2,942 | 855 |
Short-term investments | Pension ongoing income—non-service | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 387 | 341 |
Short-term investments | Pension ongoing income—non-service | Level 1 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 283 | 855 |
Short-term investments | Pension ongoing income—non-service | Level 1 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 168 | 341 |
Short-term investments | Pension ongoing income—non-service | Level 2 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 2,659 | 0 |
Short-term investments | Pension ongoing income—non-service | Level 2 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 219 | 0 |
Short-term investments | Pension ongoing income—non-service | Level 3 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Short-term investments | Pension ongoing income—non-service | Level 3 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Government securities | Pension ongoing income—non-service | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 532 | 1,492 |
Government securities | Pension ongoing income—non-service | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,635 | 2,045 |
Government securities | Pension ongoing income—non-service | Level 1 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Government securities | Pension ongoing income—non-service | Level 1 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Government securities | Pension ongoing income—non-service | Level 2 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 532 | 1,492 |
Government securities | Pension ongoing income—non-service | Level 2 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,635 | 2,045 |
Government securities | Pension ongoing income—non-service | Level 3 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Government securities | Pension ongoing income—non-service | Level 3 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Corporate bonds | Pension ongoing income—non-service | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 5,733 | 6,632 |
Corporate bonds | Pension ongoing income—non-service | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,103 | 1,031 |
Corporate bonds | Pension ongoing income—non-service | Level 1 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Corporate bonds | Pension ongoing income—non-service | Level 1 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Corporate bonds | Pension ongoing income—non-service | Level 2 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 5,733 | 6,632 |
Corporate bonds | Pension ongoing income—non-service | Level 2 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,103 | 1,031 |
Corporate bonds | Pension ongoing income—non-service | Level 3 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Corporate bonds | Pension ongoing income—non-service | Level 3 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Mortgage/Asset-backed securities | Pension ongoing income—non-service | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 676 | 1,119 |
Mortgage/Asset-backed securities | Pension ongoing income—non-service | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 10 | 31 |
Mortgage/Asset-backed securities | Pension ongoing income—non-service | Level 1 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Mortgage/Asset-backed securities | Pension ongoing income—non-service | Level 1 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Mortgage/Asset-backed securities | Pension ongoing income—non-service | Level 2 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 676 | 1,119 |
Mortgage/Asset-backed securities | Pension ongoing income—non-service | Level 2 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 10 | 31 |
Mortgage/Asset-backed securities | Pension ongoing income—non-service | Level 3 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Mortgage/Asset-backed securities | Pension ongoing income—non-service | Level 3 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Insurance contracts | Pension ongoing income—non-service | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 7 | 8 |
Insurance contracts | Pension ongoing income—non-service | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 108 | 115 |
Insurance contracts | Pension ongoing income—non-service | Level 1 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Insurance contracts | Pension ongoing income—non-service | Level 1 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Insurance contracts | Pension ongoing income—non-service | Level 2 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 7 | 8 |
Insurance contracts | Pension ongoing income—non-service | Level 2 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 108 | 115 |
Insurance contracts | Pension ongoing income—non-service | Level 3 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Insurance contracts | Pension ongoing income—non-service | Level 3 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Direct private investments | Level 3 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,293 | 1,284 | 1,336
Direct private investments | Pension ongoing income—non-service | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,293 | 1,284 |
Direct private investments | Pension ongoing income—non-service | Level 1 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Direct private investments | Pension ongoing income—non-service | Level 2 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Direct private investments | Pension ongoing income—non-service | Level 3 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,293 | 1,284 |
Real estate properties | Level 3 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 977 | 1,005 | 843
Real estate properties | Pension ongoing income—non-service | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 977 | 1,005 |
Real estate properties | Pension ongoing income—non-service | Level 1 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Real estate properties | Pension ongoing income—non-service | Level 2 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Real estate properties | Pension ongoing income—non-service | Level 3 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 977 | 1,005 |
Total | Pension ongoing income—non-service | Level 1 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 3,332 | 4,197 |
Total | Pension ongoing income—non-service | Level 1 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 168 | 343 |
Total | Pension ongoing income—non-service | Level 2 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 9,607 | 9,251 |
Total | Pension ongoing income—non-service | Level 2 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 3,676 | 3,792 |
Total | Pension ongoing income—non-service | Level 3 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 2,270 | 2,289 |
Total | Pension ongoing income—non-service | Level 3 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,695 | 1,116 |
Total | Pension ongoing income—non-service | Fair Value, Inputs, Level 1, Level 2, and Level 3 | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 15,209 | 15,737 |
Total | Pension ongoing income—non-service | Fair Value, Inputs, Level 1, Level 2, and Level 3 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 5,539 | 5,251 |
Private funds | Pension ongoing income—non-service | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,265 | 1,258 |
Private funds | Pension ongoing income—non-service | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 8 | 10 |
Real estate funds | Pension ongoing income—non-service | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 8 | 10 |
Real estate funds | Pension ongoing income—non-service | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 2 | 43 |
Commingled funds | Pension ongoing income—non-service | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 112 | 0 |
Non-U.S. equities | Pension ongoing income—non-service | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 365 | 374 |
Non-U.S. equities | Pension ongoing income—non-service | Level 1 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Non-U.S. equities | Pension ongoing income—non-service | Level 2 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 365 | 374 |
Non-U.S. equities | Pension ongoing income—non-service | Level 3 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Insurance buy-in contracts | Level 3 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,605 | 950 | 691
Insurance buy-in contracts | Pension ongoing income—non-service | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,605 | 950 |
Insurance buy-in contracts | Pension ongoing income—non-service | Level 1 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Insurance buy-in contracts | Pension ongoing income—non-service | Level 2 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Insurance buy-in contracts | Pension ongoing income—non-service | Level 3 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,605 | 950 |
Private funds | Level 3 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 74 | 36 | 33
Private funds | Pension ongoing income—non-service | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 115 | 90 |
Private funds | Pension ongoing income—non-service | Level 1 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Private funds | Pension ongoing income—non-service | Level 2 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 41 | 54 |
Private funds | Pension ongoing income—non-service | Level 3 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 74 | 36 |
Real estate funds | Level 3 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 16 | 130 | $ 163
Real estate funds | Pension ongoing income—non-service | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 16 | 130 |
Real estate funds | Pension ongoing income—non-service | Level 1 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Real estate funds | Pension ongoing income—non-service | Level 2 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Real estate funds | Pension ongoing income—non-service | Level 3 | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | $ 16 | $ 130 |

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