|
Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) (USD $)
In Millions, unless otherwise specified |
Oct. 27, 2012
|
Jul. 28, 2012
|
|---|---|---|
|
Fair Value, Inputs, Level 1 [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | $ 4,136 | $ 4,126 |
|
Fair Value, Inputs, Level 2 [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 38,737 | 37,560 |
| Liabilities, Fair Value Disclosure | 55 | 42 |
|
Fair Value, Inputs, Level 2 [Member] | Derivative Assets [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 273 | 263 |
|
Fair Value, Inputs, Level 2 [Member] | Derivative Liabilities [Member]
|
||
| Liabilities, Fair Value Disclosure | 55 | 42 |
|
Fair Value, Inputs, Level 3 [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 1 | 1 |
|
Fair Value, Inputs, Level 3 [Member] | Derivative Assets [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 1 | 1 |
|
Total Balance Fair Value Measurements [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 42,874 | 41,687 |
| Liabilities, Fair Value Disclosure | 55 | 42 |
|
Total Balance Fair Value Measurements [Member] | Derivative Assets [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 274 | 264 |
|
Total Balance Fair Value Measurements [Member] | Derivative Liabilities [Member]
|
||
| Liabilities, Fair Value Disclosure | 55 | 42 |
|
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 2,373 | 2,506 |
|
Cash and Cash Equivalents [Member] | Total Balance Fair Value Measurements [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 2,373 | 2,506 |
|
Available-for-sale Securities [Member] | US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 26,414 | 24,241 |
|
Available-for-sale Securities [Member] | US Treasury and Government [Member] | Total Balance Fair Value Measurements [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 26,414 | 24,241 |
|
Available-for-sale Securities [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 4,455 | 5,388 |
|
Available-for-sale Securities [Member] | US Government Agencies Debt Securities [Member] | Total Balance Fair Value Measurements [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 4,455 | 5,388 |
|
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 1,396 | 1,638 |
|
Available-for-sale Securities [Member] | Foreign Government Debt Securities [Member] | Total Balance Fair Value Measurements [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 1,396 | 1,638 |
|
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 6,199 | 6,030 |
|
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Total Balance Fair Value Measurements [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 6,199 | 6,030 |
|
Available-for-sale Securities [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | 1,763 | 1,620 |
|
Equity Securities [Member] | Total Balance Fair Value Measurements [Member] | Available-for-sale Securities [Member]
|
||
| Assets, Fair Value Disclosure, Recurring | $ 1,763 | $ 1,620 |