Financing Receivables And Guarantees (Schedule Of Internal Credit Risk Rating For Each Portfolio Segment And Class) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended						6 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended			6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended
	Jan. 28, 2012 Lease Receivables [Member]	Jan. 29, 2011 Lease Receivables [Member]	Jan. 28, 2012 Loan Receivables [Member]	Jan. 29, 2011 Loan Receivables [Member]	Jan. 28, 2012 Financed Service Contracts & Other [Member]	Jan. 29, 2011 Financed Service Contracts & Other [Member]	Jan. 28, 2012 Internal Credit Risk Rating 1 To 4 [Member]	Jul. 30, 2011 Internal Credit Risk Rating 1 To 4 [Member]	Jul. 30, 2011 Internal Credit Risk Rating 1 To 4 [Member] Established Markets [Member]	Jul. 30, 2011 Internal Credit Risk Rating 1 To 4 [Member] Growth Markets [Member]	Jan. 28, 2012 Internal Credit Risk Rating 1 To 4 [Member] Lease Receivables [Member]	Jul. 30, 2011 Internal Credit Risk Rating 1 To 4 [Member] Lease Receivables [Member] Established Markets [Member]	Jul. 30, 2011 Internal Credit Risk Rating 1 To 4 [Member] Lease Receivables [Member] Growth Markets [Member]	Jan. 28, 2012 Internal Credit Risk Rating 1 To 4 [Member] Loan Receivables [Member]	Jul. 30, 2011 Internal Credit Risk Rating 1 To 4 [Member] Loan Receivables [Member] Established Markets [Member]	Jul. 30, 2011 Internal Credit Risk Rating 1 To 4 [Member] Loan Receivables [Member] Growth Markets [Member]	Jan. 28, 2012 Internal Credit Risk Rating 1 To 4 [Member] Financed Service Contracts & Other [Member]	Jul. 30, 2011 Internal Credit Risk Rating 1 To 4 [Member] Financed Service Contracts & Other [Member] Established Markets [Member]	Jul. 30, 2011 Internal Credit Risk Rating 1 To 4 [Member] Financed Service Contracts & Other [Member] Growth Markets [Member]	Jan. 28, 2012 Internal Credit Risk Rating 5 To 6 [Member]	Jul. 30, 2011 Internal Credit Risk Rating 5 To 6 [Member]	Jul. 30, 2011 Internal Credit Risk Rating 5 To 6 [Member] Established Markets [Member]	Jul. 30, 2011 Internal Credit Risk Rating 5 To 6 [Member] Growth Markets [Member]	Jan. 28, 2012 Internal Credit Risk Rating 5 To 6 [Member] Lease Receivables [Member]	Jul. 30, 2011 Internal Credit Risk Rating 5 To 6 [Member] Lease Receivables [Member] Established Markets [Member]	Jul. 30, 2011 Internal Credit Risk Rating 5 To 6 [Member] Lease Receivables [Member] Growth Markets [Member]	Jan. 28, 2012 Internal Credit Risk Rating 5 To 6 [Member] Loan Receivables [Member]	Jul. 30, 2011 Internal Credit Risk Rating 5 To 6 [Member] Loan Receivables [Member] Established Markets [Member]	Jul. 30, 2011 Internal Credit Risk Rating 5 To 6 [Member] Loan Receivables [Member] Growth Markets [Member]	Jan. 28, 2012 Internal Credit Risk Rating 5 To 6 [Member] Financed Service Contracts & Other [Member]	Jul. 30, 2011 Internal Credit Risk Rating 5 To 6 [Member] Financed Service Contracts & Other [Member] Established Markets [Member]	Jul. 30, 2011 Internal Credit Risk Rating 5 To 6 [Member] Financed Service Contracts & Other [Member] Growth Markets [Member]	Jan. 28, 2012 Internal Credit Risk Rating 7 And Higher [Member]	Jul. 30, 2011 Internal Credit Risk Rating 7 And Higher [Member]	Jul. 30, 2011 Internal Credit Risk Rating 7 And Higher [Member] Established Markets [Member]	Jul. 30, 2011 Internal Credit Risk Rating 7 And Higher [Member] Growth Markets [Member]	Jan. 28, 2012 Internal Credit Risk Rating 7 And Higher [Member] Lease Receivables [Member]	Jul. 30, 2011 Internal Credit Risk Rating 7 And Higher [Member] Lease Receivables [Member] Established Markets [Member]	Jul. 30, 2011 Internal Credit Risk Rating 7 And Higher [Member] Lease Receivables [Member] Growth Markets [Member]	Jan. 28, 2012 Internal Credit Risk Rating 7 And Higher [Member] Loan Receivables [Member]	Jul. 30, 2011 Internal Credit Risk Rating 7 And Higher [Member] Loan Receivables [Member] Established Markets [Member]	Jul. 30, 2011 Internal Credit Risk Rating 7 And Higher [Member] Loan Receivables [Member] Growth Markets [Member]	Jan. 28, 2012 Internal Credit Risk Rating 7 And Higher [Member] Financed Service Contracts & Other [Member]	Jul. 30, 2011 Internal Credit Risk Rating 7 And Higher [Member] Financed Service Contracts & Other [Member] Established Markets [Member]	Jul. 30, 2011 Internal Credit Risk Rating 7 And Higher [Member] Financed Service Contracts & Other [Member] Growth Markets [Member]	Jan. 28, 2012 Total Internal Credit Risk Rating [Member]	Jul. 30, 2011 Total Internal Credit Risk Rating [Member]	Jul. 30, 2011 Total Internal Credit Risk Rating [Member] Established Markets [Member]	Jul. 30, 2011 Total Internal Credit Risk Rating [Member] Growth Markets [Member]	Jan. 28, 2012 Total Internal Credit Risk Rating [Member] Lease Receivables [Member]	Jul. 30, 2011 Total Internal Credit Risk Rating [Member] Lease Receivables [Member] Established Markets [Member]	Jul. 30, 2011 Total Internal Credit Risk Rating [Member] Lease Receivables [Member] Growth Markets [Member]	Jan. 28, 2012 Total Internal Credit Risk Rating [Member] Loan Receivables [Member]	Jul. 30, 2011 Total Internal Credit Risk Rating [Member] Loan Receivables [Member] Established Markets [Member]	Jul. 30, 2011 Total Internal Credit Risk Rating [Member] Loan Receivables [Member] Growth Markets [Member]	Jan. 28, 2012 Total Internal Credit Risk Rating [Member] Financed Service Contracts & Other [Member]	Jul. 30, 2011 Total Internal Credit Risk Rating [Member] Financed Service Contracts & Other [Member] Established Markets [Member]	Jul. 30, 2011 Total Internal Credit Risk Rating [Member] Financed Service Contracts & Other [Member] Growth Markets [Member]	Jan. 28, 2012 Residual Value [Member]	Jul. 30, 2011 Residual Value [Member]	Jul. 30, 2011 Residual Value [Member] Established Markets [Member]	Jul. 30, 2011 Residual Value [Member] Growth Markets [Member]	Jan. 28, 2012 Residual Value [Member] Lease Receivables [Member]	Jul. 30, 2011 Residual Value [Member] Lease Receivables [Member] Established Markets [Member]	Jul. 30, 2011 Residual Value [Member] Lease Receivables [Member] Growth Markets [Member]	Jan. 28, 2012 Gross Receivables, Net Of Unearned Income [Member]	Jul. 30, 2011 Gross Receivables, Net Of Unearned Income [Member]	Jul. 30, 2011 Gross Receivables, Net Of Unearned Income [Member] Established Markets [Member]	Jul. 30, 2011 Gross Receivables, Net Of Unearned Income [Member] Growth Markets [Member]	Jan. 28, 2012 Gross Receivables, Net Of Unearned Income [Member] Lease Receivables [Member]	Jul. 30, 2011 Gross Receivables, Net Of Unearned Income [Member] Lease Receivables [Member] Established Markets [Member]	Jul. 30, 2011 Gross Receivables, Net Of Unearned Income [Member] Lease Receivables [Member] Growth Markets [Member]	Jan. 28, 2012 Gross Receivables, Net Of Unearned Income [Member] Loan Receivables [Member]	Jul. 30, 2011 Gross Receivables, Net Of Unearned Income [Member] Loan Receivables [Member] Established Markets [Member]	Jul. 30, 2011 Gross Receivables, Net Of Unearned Income [Member] Loan Receivables [Member] Growth Markets [Member]	Jan. 28, 2012 Gross Receivables, Net Of Unearned Income [Member] Financed Service Contracts & Other [Member]	Jul. 30, 2011 Gross Receivables, Net Of Unearned Income [Member] Financed Service Contracts & Other [Member] Established Markets [Member]	Jul. 30, 2011 Gross Receivables, Net Of Unearned Income [Member] Financed Service Contracts & Other [Member] Growth Markets [Member]
Financing Receivable, Recorded Investment [Line Items]
Gross receivables net of unearned income	$ 3,049	$ 2,513	$ 1,673	$ 1,294	$ 2,666	$ 2,285	$ 3,906	$ 3,534	$ 3,040	$ 494	$ 1,502	$ 1,214	$ 35	$ 744	$ 204	$ 458	$ 1,660	$ 1,622	$ 1	$ 3,063	$ 3,000	$ 2,308	$ 692	$ 1,226	$ 1,182	$ 93	$ 899	$ 187	$ 580	$ 938	$ 939	$ 19	$ 129	$ 136	$ 79	$ 57	$ 31	$ 23	$ 18	$ 30	$ 4	$ 35	$ 68	$ 52	$ 4	$ 7,098	$ 6,670	$ 5,427	$ 1,243	$ 2,759	$ 2,419	$ 146	$ 1,673	$ 395	$ 1,073	$ 2,666	$ 2,613	$ 24	$ 290	$ 296	$ 292	$ 4	$ 290	$ 292	$ 4	$ 7,388	$ 6,966	$ 5,719	$ 1,247	$ 3,049	$ 2,711	$ 150	$ 1,673	$ 395	$ 1,073	$ 2,666	$ 2,613	$ 24