Financing Receivables And Guarantees (Allowance For Credit Loss And Related Financing Receivables) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jan. 26, 2013	Oct. 27, 2012	Jan. 28, 2012	Oct. 29, 2011	Jul. 28, 2012
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Capital Leases, Net Investment in Direct Financing Leases	$ 8,092				$ 7,626
Lease Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	248	247	233	237
Provisions	(1)	(2)	18	2
Foreign exchange and other	0	3	(1)	(6)
Financing Receivable, Allowance for Credit Losses	247	248	250	233
Capital Leases, Net Investment in Direct Financing Leases	3,444		3,049		3,179
Loan Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	114	122	103	103
Provisions	(14)	(10)	4	5
Foreign exchange and other	1	2	3	(5)
Financing Receivable, Allowance for Credit Losses	101	114	110	103
Capital Leases, Net Investment in Direct Financing Leases	1,785		1,673		1,796
Financed Service Contracts And Other [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	12	11	29	27
Provisions	2	1	(18)	2
Foreign exchange and other	(1)	0	(2)	0
Financing Receivable, Allowance for Credit Losses	13	12	9	29
Capital Leases, Net Investment in Direct Financing Leases	2,863		2,666		2,651
Total Allowance [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Financing Receivable, Allowance for Credit Losses	374	380	365	367
Provisions	(13)	(11)	4	9
Foreign exchange and other	0	5	0	(11)
Financing Receivable, Allowance for Credit Losses	361	374	369	365
Capital Leases, Net Investment in Direct Financing Leases	$ 8,092		$ 7,388