Statement of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Statement [Abstract]
Operating Revenue	$ 4,059	$ 3,966	$ 11,951	$ 11,966
Cost of revenue	2,253	2,230	6,685	6,637
Selling, administrative, and research and development expenses	676	658	2,075	2,020
Amortization and impairment of intangible assets	18	26	60	76
Operating Income	1,112	1,052	3,131	3,233
Interest expense	(75)	(69)	(217)	(215)
Other income (expense)	12	379	28	421
Income Before Taxes	1,049	1,362	2,942	3,439
Income Taxes	228	202	666	701
Net Income	$ 821	$ 1,160	$ 2,276	$ 2,738
Net Income Per Share:
Basic (in dollars per share)	$ 2.82	$ 3.92	$ 7.79	$ 9.20
Diluted (in dollars per share)	$ 2.81	$ 3.91	$ 7.77	$ 9.17
Shares of Common Stock Outstanding During the Period:
Average (in shares)	290.8	296.1	292.2	297.6
Average assuming dilution (in shares)	291.7	297.0	293.0	298.5

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.