Document Entity Information (USD $) In Billions, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Oct. 31, 2012	Mar. 31, 2012
Document And Entity Information [Abstract]
Entity Registrant Name	AIR PRODUCTS & CHEMICALS INC /DE/
Entity Central Index Key	0000002969
Document Type	10-K
Document Period End Date	Sep. 30, 2012
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Entity Filer Category	Large Accelerated Filer
EntityCurrentReportingStatus	Yes
Entity Well-known Seasoned Issuer	Yes
EntityVoluntaryFiler	No
Entity Common Stock, Shares Outstanding		212,850,078
Entity Public Float			$ 19.4