Statement of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Operating Revenue	$ 4,011	$ 3,676	$ 7,950	$ 7,220
Cost of revenue	2,392	2,163	4,749	4,202
Selling, administrative, and research and development expenses	659	588	1,311	1,154
Amortization and impairment of intangible assets	34	32	69	66
Operating Income	926	893	1,821	1,798
Interest expense	(47)	(52)	(95)	(104)
Other income (expense)	24	22	38	34
Income Before Taxes	903	863	1,764	1,728
Income Taxes	165	88	364	282
Net Income	$ 738	$ 775	$ 1,400	$ 1,446
Net Income Per Share:
Basic (in dollars per share)	$ 2.37	$ 2.46	$ 4.49	$ 4.58
Diluted (in dollars per share)	$ 2.37	$ 2.45	$ 4.48	$ 4.56
Shares of Common Stock Outstanding During the Period:
Average (in shares)	310.6	315.6	311.5	316.1
Average assuming dilution (in shares)	311.5	316.9	312.6	317.4

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.