Fair Value Measurements, Valuation Techniques (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
Oct. 26, 2012	Oct. 26, 2012 Corporate Debt Securities	Oct. 26, 2012 Auction Rate Securities	Oct. 26, 2012 Mortgage Backed Securities	Oct. 26, 2012 Other Asset-backed Securities	Oct. 26, 2012 Recurring Level 3	Oct. 28, 2011 Recurring Level 3	Oct. 28, 2011 Recurring Level 3	Oct. 26, 2012 Recurring Level 3 Corporate Debt Securities	Oct. 28, 2011 Recurring Level 3 Corporate Debt Securities	Oct. 28, 2011 Recurring Level 3 Corporate Debt Securities	Oct. 26, 2012 Recurring Level 3 Auction Rate Securities	Oct. 28, 2011 Recurring Level 3 Auction Rate Securities	Oct. 28, 2011 Recurring Level 3 Auction Rate Securities	Oct. 26, 2012 Recurring Level 3 Auction Rate Securities Discounted Cash Flow	Oct. 26, 2012 Recurring Level 3 Auction Rate Securities Discounted Cash Flow Minimum	Oct. 26, 2012 Recurring Level 3 Auction Rate Securities Discounted Cash Flow Maximum	Oct. 26, 2012 Recurring Level 3 Auction Rate Securities Discounted Cash Flow Weighted Average	Oct. 26, 2012 Recurring Level 3 Mortgage Backed Securities	Oct. 28, 2011 Recurring Level 3 Mortgage Backed Securities	Oct. 28, 2011 Recurring Level 3 Mortgage Backed Securities	Oct. 26, 2012 Recurring Level 3 Other Asset-backed Securities	Oct. 28, 2011 Recurring Level 3 Other Asset-backed Securities	Oct. 28, 2011 Recurring Level 3 Other Asset-backed Securities
Fair Value Inputs
Years to Principal Recovery																2 years	12 years	3 years
Illiquidity Premium															6.00%
Reconciliation of the beginning and ending balances of items measured at fair value on a recurring basis that used significant unobservable inputs
Beginning balance	$ 172	$ 10	$ 127	$ 29	$ 6	$ 173	$ 190	$ 191	$ 10	$ 17	$ 17	$ 129	$ 134	$ 133					$ 28	$ 33	$ 35	$ 6	$ 6	$ 6
Total realized losses and other-than-temporary impairment losses included in earnings	0	0	0	0	0		(1)	(2)		(1)	(1)		0	0						0	0		0	(1)
Total unrealized gains/(losses) included in other comprehensive income	1	0	2	0	(1)	(1)	(7)	(5)	0	1	1	0	(7)	(6)					0	(1)	(1)	(1)	0	1
Settlements	(2)	0	0	(2)	0	(1)	(8)	(10)	0	(7)	(7)	0	0	0					(1)	(1)	(3)	0	0	0
Ending balance	$ 171	$ 10	$ 129	$ 27	$ 5	$ 171	$ 174	$ 174	$ 10	$ 10	$ 10	$ 129	$ 127	$ 127					$ 27	$ 31	$ 31	$ 5	$ 6	$ 6

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Illiquidity premium used as an input to measure fair value.

+ References

No definition available.

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- Definition

Number of years to principal recovery, used as an input to measure fair value.

+ References

No definition available.

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity).

+ References

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- Definition

Settlements that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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- Definition

This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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