Statement of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Operating Revenue	$ 4,011	$ 3,556	$ 11,961	$ 10,776
Cost of revenue	2,371	2,096	7,120	6,298
Selling, administrative, and research and development expenses	624	581	1,935	1,735
Amortization and impairment of intangible assets	33	34	102	100
Operating Income	983	845	2,804	2,643
Interest expense	(52)	(49)	(147)	(153)
Other income (expense)	26	10	64	44
Income Before Taxes	957	806	2,721	2,534
Income Taxes	230	167	594	449
Net Income	$ 727	$ 639	$ 2,127	$ 2,085
Net Income Per Share:
Basic (in dollars per share)	$ 2.36	$ 2.03	$ 6.85	$ 6.61
Diluted (in dollars per share)	$ 2.35	$ 2.02	$ 6.83	$ 6.58
Shares of Common Stock Outstanding During the Period:
Average (in shares)	308.8	314.6	310.6	315.6
Average assuming dilution (in shares)	309.7	315.9	311.6	316.9

Amortization and Impairment of Intangible Assets

No definition available.

Name:	itw_AmortizationandImpairmentofIntangibleAssets
Namespace Prefix:	itw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate total costs related to selling a firm's product and services, as well as all other general, administrative, and research and development expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References

No definition available.