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Financial Instruments - Activity Related to the Company's Investment Portfolio and Available-for-sale Debt Securities Contractual Maturities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 29, 2016 | Jan. 23, 2015 | Jan. 29, 2016 | Jan. 23, 2015
AFS Debt Maturities |  |  |  |
Due in one year or less | $ 2,197 |  | $ 2,197 |
Due after one year through five years | 6,294 |  | 6,294 |
Due after five years through ten years | 3,050 |  | 3,050 |
Due after ten years | 285 |  | 285 |
Total | 11,826 |  | 11,826 |
Debt [Member] |  |  |  |
AFS Gross Realized Gain (Loss) |  |  |  |
Proceeds from sales | 1,261 | $ 1,478 | 3,979 | $ 4,114
Gross realized gains | 2 | 10 | 11 | 26
Gross realized losses | (9) | (4) | (21) | (9)
Impairment losses recognized | 0 | 0 | 0 | 0
Equity [Member] |  |  |  |
AFS Gross Realized Gain (Loss) |  |  |  |
Proceeds from sales | 4 | 208 | 38 | 237
Gross realized gains | 4 | 99 | 36 | 157
Gross realized losses | 0 | 0 | 0 | 0
Impairment losses recognized | $ (2) | $ (1) | (43) | (22)
Equity [Member] | Other expense, net [Member] |  |  |  |
AFS Gross Realized Gain (Loss) |  |  |  |
Gross realized gains |  |  | $ 9 | $ 41

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- Definition Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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