| Document and Entity Information | Jul. 06, 2021 |
| Document And Entity Information [Line Items] | |
| Document Period End Date | Jul. 6, 2021 |
| Entity Registrant Name | AIR PRODUCTS & CHEMICALS INC /DE/ |
| Amendment Flag | true |
| Entity Central Index Key | 0000002969 |
| Document Type | 8-K/A |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-04534 |
| Entity Tax Identification Number | 23-1274455 |
| Entity Address, Address Line One | 7201 Hamilton Boulevard |
| Entity Address, City or Town | Allentown |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 18195-1501 |
| City Area Code | (610) |
| Local Phone Number | 481-4911 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Description | This Amendment No. 1 amends the Current Report on Form 8-K filed by Air Products and Chemicals, Inc. (the “Company”) on July 9, 2021 to report the appointment of Melissa Schaeffer as the Company’s Chief Financial Officer, effective August 10, 2021, in connection with the retirement of the Company’s current Chief Financial Officer, M. Scott Crocco. The Company is filing this amendment solely to report certain compensatory arrangements with Ms. Schaeffer in connection with her promotion. |
| Common Class A [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock, par value $1.00 per share |
| Trading Symbol | APD |
| Security Exchange Name | NYSE |
| Euro Notes Due 2025 One Percent [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 1.000% Euro Notes due 2025 |
| Trading Symbol | APD25 |
| Security Exchange Name | NYSE |
| A 0500 Notes Due 2028 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 0.500% Euro Notes due 2028 |
| Trading Symbol | APD28 |
| Security Exchange Name | NYSE |
| A 0800 Notes Due 2032 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 0.800% Euro Notes due 2032 |
| Trading Symbol | APD32 |
| Security Exchange Name | NYSE |
