CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income	$ 4,865,000,000	$ 6,230,000,000	$ 6,828,000,000
Less: Net income attributable to the noncontrolling interest	86,000,000	87,000,000	63,000,000
Net income attributable to Honeywell	4,779,000,000	6,143,000,000	6,765,000,000
Adjustments to reconcile net income attributable to Honeywell to net cash provided by operating activities [Abstract]
Depreciation	644,000,000	673,000,000	721,000,000
Amortization	358,000,000	415,000,000	395,000,000
Repositioning and other charges	575,000,000	546,000,000	1,091,000,000
Net payments for repositioning and other charges	(833,000,000)	(376,000,000)	(652,000,000)
Pension and other postretirement income	(798,000,000)	(516,000,000)	(987,000,000)
Pension and other postretirement benefit payments	(47,000,000)	(78,000,000)	(80,000,000)
Stock compensation expense	168,000,000	153,000,000	175,000,000
Deferred income taxes	(175,000,000)	179,000,000	(586,000,000)
Reimbursement receivables charge	509,000,000	0	0
Other	(335,000,000)	(286,000,000)	(694,000,000)
Changes in assets and liabilities, net of the effects of acquisitions and divestitures: [Abstract]
Accounts receivable	669,000,000	11,000,000	(236,000,000)
Inventories	(67,000,000)	(100,000,000)	(503,000,000)
Other current assets	191,000,000	(430,000,000)	218,000,000
Accounts payable	15,000,000	118,000,000	733,000,000
Accrued liabilities	555,000,000	445,000,000	74,000,000
Net cash provided by (used for) operating activities	6,208,000,000	6,897,000,000	6,434,000,000
Cash flows from investing activities: [Abstract]
Expenditures for property, plant and equipment	(906,000,000)	(839,000,000)	(828,000,000)
Proceeds from disposals of property, plant and equipment	57,000,000	43,000,000	15,000,000
Increase in investments	(3,236,000,000)	(4,253,000,000)	(4,059,000,000)
Decrease in investments	3,508,000,000	4,464,000,000	6,032,000,000
Receipts (payments) from settlements of derivative contracts	(149,000,000)	102,000,000	402,000,000
Cash paid for acquisitions, net of cash acquired	(261,000,000)	(50,000,000)	(535,000,000)
Net cash provided by (used for) investing activities	(987,000,000)	(533,000,000)	1,027,000,000
Cash flows from financing activities: [Abstract]
Proceeds from issuance of commercial paper and other short-term borrowings	10,474,000,000	14,199,000,000	23,891,000,000
Payments of commercial paper and other short-term borrowings	(10,400,000,000)	(14,199,000,000)	(24,095,000,000)
Proceeds from issuance of common stock	393,000,000	498,000,000	267,000,000
Proceeds from issuance of long-term debt	10,125,000,000	2,726,000,000	27,000,000
Payments of long-term debt	(4,308,000,000)	(2,903,000,000)	(1,330,000,000)
Repurchases of common stock	(3,714,000,000)	(4,400,000,000)	(4,000,000,000)
Cash dividends paid	(2,592,000,000)	(2,442,000,000)	(2,272,000,000)
Pre-separation funding	0	0	2,801,000,000
Spin-off cash	0	0	(179,000,000)
Other	(59,000,000)	(79,000,000)	(142,000,000)
Net cash provided by (used for) financing activities	(81,000,000)	(6,600,000,000)	(5,032,000,000)
Effect of foreign exchange rate changes on cash and cash equivalents	68,000,000	16,000,000	(201,000,000)
Net increase (decrease) in cash and cash equivalents	5,208,000,000	(220,000,000)	2,228,000,000
Cash and cash equivalents at beginning of period	9,067,000,000	9,287,000,000	7,059,000,000
Cash and cash equivalents at end of period	$ 14,275,000,000	$ 9,067,000,000	$ 9,287,000,000