|
Investments (Summary Of Available-For-Sale Investments) (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 12 Months Ended |
|---|---|---|
|
Oct. 26, 2013
|
Jul. 27, 2013
|
|
| Schedule of Investments [Line Items] | ||
| Amortized Cost | $ 42,154 | $ 41,930 |
| Gross Unrealized Gains | 819 | 825 |
| Gross Unrealized Losses | (26) | (70) |
| Fair Value | 42,947 | 42,685 |
|
Publicly Traded Equity Securities [Member]
|
||
| Schedule of Investments [Line Items] | ||
| Amortized Cost | 1,820 | 2,063 |
| Gross Unrealized Gains | 696 | 738 |
| Gross Unrealized Losses | (2) | (4) |
| Fair Value | 2,514 | 2,797 |
|
Fixed Income Investments [Member]
|
||
| Schedule of Investments [Line Items] | ||
| Amortized Cost | 40,334 | 39,867 |
| Gross Unrealized Gains | 123 | 87 |
| Gross Unrealized Losses | (24) | (66) |
| Fair Value | 40,433 | 39,888 |
|
Fixed Income Investments [Member] | US Government Securities[Member]
|
||
| Schedule of Investments [Line Items] | ||
| Amortized Cost | 28,603 | 27,814 |
| Gross Unrealized Gains | 37 | 22 |
| Gross Unrealized Losses | (2) | (13) |
| Fair Value | 28,638 | 27,823 |
|
Fixed Income Investments [Member] | US Government Agencies Securities [Member]
|
||
| Schedule of Investments [Line Items] | ||
| Amortized Cost | 2,394 | 3,083 |
| Gross Unrealized Gains | 5 | 7 |
| Gross Unrealized Losses | 0 | (1) |
| Fair Value | 2,399 | 3,089 |
|
Fixed Income Investments [Member] | Non-US Government and Agency Securities [Member]
|
||
| Schedule of Investments [Line Items] | ||
| Amortized Cost | 907 | 1,094 |
| Gross Unrealized Gains | 3 | 3 |
| Gross Unrealized Losses | (1) | (2) |
| Fair Value | 909 | 1,095 |
|
Fixed Income Investments [Member] | Corporate Debt Securities [Member]
|
||
| Schedule of Investments [Line Items] | ||
| Amortized Cost | 7,974 | 7,876 |
| Gross Unrealized Gains | 73 | 55 |
| Gross Unrealized Losses | (21) | (50) |
| Fair Value | 8,026 | 7,881 |
|
Fixed Income Investments [Member] | U.S. agency mortgage-backed Securities
|
||
| Schedule of Investments [Line Items] | ||
| Amortized Cost | 456 | |
| Gross Unrealized Gains | 5 | |
| Gross Unrealized Losses | 0 | |
| Fair Value | $ 461 |