Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) (USD $) In Millions, unless otherwise specified	Apr. 27, 2013	Apr. 28, 2012
Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure, Recurring	$ 5,413	$ 4,126
Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure, Recurring	40,426	37,560
Liabilities, Fair Value Disclosure	94	42
Fair Value, Inputs, Level 2 [Member] | Derivative Assets [Member]
Assets, Fair Value Disclosure, Recurring	234	263
Fair Value, Inputs, Level 2 [Member] | Derivative Liabilities [Member]
Liabilities, Fair Value Disclosure	94	42
Fair Value, Inputs, Level 3 [Member]
Assets, Fair Value Disclosure, Recurring	0	1
Fair Value, Inputs, Level 3 [Member] | Derivative Assets [Member]
Assets, Fair Value Disclosure, Recurring	0	1
Total Balance Fair Value Measurements [Member]
Assets, Fair Value Disclosure, Recurring	45,839	41,687
Liabilities, Fair Value Disclosure	94	42
Total Balance Fair Value Measurements [Member] | Derivative Assets [Member]
Assets, Fair Value Disclosure, Recurring	234	264
Total Balance Fair Value Measurements [Member] | Derivative Liabilities [Member]
Liabilities, Fair Value Disclosure	94	42
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure, Recurring	3,339	2,506
Cash and Cash Equivalents [Member] | Total Balance Fair Value Measurements [Member]
Assets, Fair Value Disclosure, Recurring	3,339	2,506
Available-for-sale Securities [Member] | US Government Securities[Member] | Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure, Recurring	28,443	24,241
Available-for-sale Securities [Member] | US Government Securities[Member] | Total Balance Fair Value Measurements [Member]
Assets, Fair Value Disclosure, Recurring	28,443	24,241
Available-for-sale Securities [Member] | US Government Agencies Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure, Recurring	3,309	5,388
Available-for-sale Securities [Member] | US Government Agencies Securities [Member] | Total Balance Fair Value Measurements [Member]
Assets, Fair Value Disclosure, Recurring	3,309	5,388
Available-for-sale Securities [Member] | Non-US Government and Agency Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure, Recurring	1,012	1,638
Available-for-sale Securities [Member] | Non-US Government and Agency Securities [Member] | Total Balance Fair Value Measurements [Member]
Assets, Fair Value Disclosure, Recurring	1,012	1,638
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, Fair Value Disclosure, Recurring	7,428	6,030
Available-for-sale Securities [Member] | Corporate Debt Securities [Member] | Total Balance Fair Value Measurements [Member]
Assets, Fair Value Disclosure, Recurring	7,428	6,030
Available-for-sale Securities [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, Fair Value Disclosure, Recurring	2,074	1,620
Equity Securities [Member] | Total Balance Fair Value Measurements [Member] | Available-for-sale Securities [Member]
Assets, Fair Value Disclosure, Recurring	$ 2,074	$ 1,620