Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jul. 26, 2013		Jul. 27, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning of period	$ (492)
Other comprehensive (loss) income before reclassifications, before tax	(119)
Tax benefit (expense)	43
Other comprehensive (loss) income before reclassifications, net of tax	(76)
Reclassifications, before tax	(10)
Tax benefit (expense)	2
Reclassifications, net of tax	(8)
Other comprehensive (loss) income, net of tax	(84)		(42)
Accumulated other comprehensive loss, end of period	(576)
Unrealized Gain (Loss) on Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning of period	97
Other comprehensive (loss) income before reclassifications, before tax	(131)
Tax benefit (expense)	48
Other comprehensive (loss) income before reclassifications, net of tax	(83)
Reclassifications, before tax	(18)
Tax benefit (expense)	6
Reclassifications, net of tax	(12)	[1]
Other comprehensive (loss) income, net of tax	(95)
Accumulated other comprehensive loss, end of period	2
Cumulative Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning of period	285	[2]
Other comprehensive (loss) income before reclassifications, before tax	(3)	[2]
Tax benefit (expense)	0	[2]
Other comprehensive (loss) income before reclassifications, net of tax	(3)	[2]
Reclassifications, before tax	0	[2]
Tax benefit (expense)	0	[2]
Reclassifications, net of tax	0	[2]
Other comprehensive (loss) income, net of tax	(3)	[2]
Accumulated other comprehensive loss, end of period	282	[2]
Net Change in Retirement Obligations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning of period	(852)
Other comprehensive (loss) income before reclassifications, before tax	0
Tax benefit (expense)	0
Other comprehensive (loss) income before reclassifications, net of tax	0
Reclassifications, before tax	23
Tax benefit (expense)	(9)
Reclassifications, net of tax	14	[3]
Other comprehensive (loss) income, net of tax	14
Accumulated other comprehensive loss, end of period	(838)
Unrealized Gain (Loss) on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning of period	(22)
Other comprehensive (loss) income before reclassifications, before tax	15
Tax benefit (expense)	(5)
Other comprehensive (loss) income before reclassifications, net of tax	10
Reclassifications, before tax	(15)
Tax benefit (expense)	5
Reclassifications, net of tax	(10)	[4]
Other comprehensive (loss) income, net of tax	0
Accumulated other comprehensive loss, end of period	$ (22)

[1] Represents net realized gains on sales of available-for-sale securities that were reclassified from AOCI to other expense, net (see Note 6).

[2] Taxes are not provided on cumulative translation adjustments as substantially all translation adjustments relate to earnings that are intended to be indefinitely reinvested outside the U.S. Includes translation of the unrealized gains (losses) on certain foreign exchange rate derivatives held by non-U.S. functional currency entities.

[3] Includes net amortization of prior service costs and actuarial losses included in net periodic benefit cost (see Note 17).

[4] Relates to foreign currency cash flow hedges that were reclassified from AOCI to other expense, net or cost of products sold and forward starting interest rate derivative instruments that were reclassified from AOCI to interest expense, net (see Note 9).