Financing Receivables and Guarantees (Allowance for Credit Loss and Related Financing Receivables) (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
	Apr. 30, 2011	Apr. 30, 2011
Allowance for credit loss	$ 344	$ 301
Provisions	27	64
Write-offs, net	(8)	(10)
Foreign exchange and other	9	17
Allowance for credit loss	372	372
Gross receivables as of April 30, 2011, net of unearned income	6,516	6,516
Lease Receivables [Member]
Allowance for credit loss	233	207
Provisions	3	24
Write-offs, net	(5)	(6)
Foreign exchange and other	5	11
Allowance for credit loss	236	236
Gross receivables as of April 30, 2011, net of unearned income	2,648	2,648
Financed Service Contracts & Other [Member]
Allowance for credit loss	27	21
Provisions	(2)	5
Write-offs, net	(1)	(2)
Foreign exchange and other	1	1
Allowance for credit loss	25	25
Gross receivables as of April 30, 2011, net of unearned income	2,495	2,495
Loan Receivables [Member]
Allowance for credit loss	84	73
Provisions	26	35
Write-offs, net	(2)	(2)
Foreign exchange and other	3	5
Allowance for credit loss	111	111
Gross receivables as of April 30, 2011, net of unearned income	$ 1,373	$ 1,373