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Investments (Tables)
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3 Months Ended |
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Oct. 27, 2012
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| Investments [Abstract] |
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| Schedule of Available-for-sale Securities Reconciliation [Table Text Block] |
The following tables summarize the Company’s available-for-sale investments (in millions): | | | | | | | | | | | | | | | | | October 27, 2012 | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized Losses | | Fair Value | Fixed income securities: | | | | | | | | U.S. government securities | $ | 26,401 |
| | $ | 22 |
| | $ | (9 | ) | | $ | 26,414 |
| U.S. government agency securities | 4,441 |
| | 14 |
| | — |
| | 4,455 |
| Non-U.S. government and agency securities | 1,388 |
| | 8 |
| | — |
| | 1,396 |
| Corporate debt securities | 6,105 |
| | 96 |
| | (2 | ) | | 6,199 |
| Total fixed income securities | 38,335 |
| | 140 |
| | (11 | ) | | 38,464 |
| Publicly traded equity securities | 1,263 |
| | 512 |
| | (12 | ) | | 1,763 |
| Total | $ | 39,598 |
| | $ | 652 |
| | $ | (23 | ) | | $ | 40,227 |
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| | | | | | | | | | | | | | | | | July 28, 2012 | Amortized Cost | | Gross Unrealized Gains | | Gross Unrealized Losses | | Fair Value | Fixed income securities: | | | | | | | | U.S. government securities | $ | 24,201 |
| | $ | 41 |
| | $ | (1 | ) | | $ | 24,241 |
| U.S. government agency securities | 5,367 |
| | 21 |
| | — |
| | 5,388 |
| Non-U.S. government and agency securities | 1,629 |
| | 9 |
| | — |
| | 1,638 |
| Corporate debt securities | 5,959 |
| | 74 |
| | (3 | ) | | 6,030 |
| Total fixed income securities | 37,156 |
| | 145 |
| | (4 | ) | | 37,297 |
| Publicly traded equity securities | 1,107 |
| | 524 |
| | (11 | ) | | 1,620 |
| Total | $ | 38,263 |
| | $ | 669 |
| | $ | (15 | ) | | $ | 38,917 |
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| Schedule of Realized Gain (Loss) [Table Text Block] |
The following table presents the gross realized gains and gross realized losses related to the Company’s available-for-sale investments (in millions): | | | | | | | | | Three Months Ended | October 27,
2012 | | October 29,
2011 | Gross realized gains | $ | 72 |
| | $ | 236 |
| Gross realized losses | (45 | ) | | (227 | ) | Total | $ | 27 |
| | $ | 9 |
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The following table presents the realized net gains (losses) related to the Company's available-for-sale investments by security type (in millions): | | | | | | | | | Three Months Ended | October 27,
2012 | | October 29,
2011 | Net gains (losses) on investments in publicly traded equity securities | $ | 10 |
| | $ | (16 | ) | Net gains on investments in fixed income securities | 17 |
| | 25 |
| Total | $ | 27 |
| | $ | 9 |
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| Schedule of Unrealized Loss on Investments [Table Text Block] |
The following tables present the breakdown of the available-for-sale investments with gross unrealized losses and the duration that those losses had been unrealized at October 27, 2012 and July 28, 2012 (in millions): | | | | | | | | | | | | | | | | | | | | | | | | | | UNREALIZED LOSSES LESS THAN 12 MONTHS | | UNREALIZED LOSSES 12 MONTHS OR GREATER | | TOTAL | October 27, 2012 | Fair Value | | Gross Unrealized Losses | | Fair Value | | Gross Unrealized Losses | | Fair Value | | Gross Unrealized Losses | Fixed income securities: | | | | | | | | | | | | U.S. government agency securities | $ | 12,477 |
| | $ | (9 | ) | | $ | — |
| | $ | — |
| | $ | 12,477 |
| | $ | (9 | ) | Corporate debt securities | 469 |
| | (2 | ) | | — |
| | — |
| | 469 |
| | (2 | ) | Total fixed income securities | 12,946 |
| | (11 | ) | | — |
| | — |
| | 12,946 |
| | (11 | ) | Publicly traded equity securities | 270 |
| | (12 | ) | | — |
| | — |
| | 270 |
| | (12 | ) | Total | $ | 13,216 |
| | $ | (23 | ) | | $ | — |
| | $ | — |
| | $ | 13,216 |
| | $ | (23 | ) |
| | | | | | | | | | | | | | | | | | | | | | | | | | UNREALIZED LOSSES LESS THAN 12 MONTHS | | UNREALIZED LOSSES 12 MONTHS OR GREATER | | TOTAL | July 28, 2012 | Fair Value | | Gross Unrealized Losses | | Fair Value | | Gross Unrealized Losses | | Fair Value | | Gross Unrealized Losses | Fixed income securities: | | | | | | | | | | | | U.S. government agency securities | $ | 5,357 |
| | $ | (1 | ) | | $ | — |
| | $ | — |
| | $ | 5,357 |
| | $ | (1 | ) | Corporate debt securities | 603 |
| | (3 | ) | | 14 |
| | — |
| | 617 |
| | (3 | ) | Total fixed income securities | 5,960 |
| | (4 | ) | | 14 |
| | — |
| | 5,974 |
| | (4 | ) | Publicly traded equity securities | 167 |
| | (8 | ) | | 20 |
| | (3 | ) | | 187 |
| | (11 | ) | Total | $ | 6,127 |
| | $ | (12 | ) | | $ | 34 |
| | $ | (3 | ) | | $ | 6,161 |
| | $ | (15 | ) |
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| Investments Classified by Contractual Maturity Date [Table Text Block] |
The following table summarizes the maturities of the Company’s fixed income securities at October 27, 2012 (in millions): | | | | | | | | | | Amortized Cost | | Fair Value | Less than 1 year | $ | 17,224 |
| | $ | 17,238 |
| Due in 1 to 2 years | 10,763 |
| | 10,798 |
| Due in 2 to 5 years | 10,265 |
| | 10,339 |
| Due after 5 years | 83 |
| | 89 |
| Total | $ | 38,335 |
| | $ | 38,464 |
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