| Cover Page | Nov. 11, 2020 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 11, 2020 |
| Entity Registrant Name | AIR PRODUCTS AND CHEMICALS, INC. |
| Entity Central Index Key | 0000002969 |
| Amendment Flag | false |
| Entity Incorporation, State or 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 |
| Common Stock, par value $1.00 per share | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Common Stock, par value $1.00 per share |
| Trading Symbol | APD |
| Security Exchange Name | NYSE |
| 0.375% Euro Notes due 2021 | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | 0.375% Euro Notes due 2021 |
| Trading Symbol | APD21B |
| Security Exchange Name | NYSE |
| 1.000% Euro Notes due 2025 | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | 1.000% Euro Notes due 2025 |
| Trading Symbol | APD25 |
| Security Exchange Name | NYSE |
| 0.500% Euro Notes due 2028 | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | 0.500% Euro Notes due 2028 |
| Trading Symbol | APD28 |
| Security Exchange Name | NYSE |
| 0.800% Euro Notes due 2032 | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | 0.800% Euro Notes due 2032 |
| Trading Symbol | APD32 |
| Security Exchange Name | NYSE |
