Derivatives and Currency Exchange Risk Management , Balance Sheet Presentation (Details) - USD ($) $ in Millions	Apr. 29, 2016	Apr. 24, 2015
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 248	$ 733
Liability derivatives	219	116
Interest rate contracts [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	89	89
Liability derivatives	48	71
Commodity derivatives [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	1
Currency exchange rate contracts [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	145	644
Liability derivatives	166	45
Cross currency interest rate contracts [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	14
Liability derivatives	4
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	221	614
Liability derivatives	191	86
Designated as Hedging Instrument [Member] | Interest rate contracts [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	0	10
Designated as Hedging Instrument [Member] | Interest rate contracts [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	89	79
Designated as Hedging Instrument [Member] | Interest rate contracts [Member] | Other accrued expenses [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	0	0
Designated as Hedging Instrument [Member] | Interest rate contracts [Member] | Other long-term liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	48	71
Designated as Hedging Instrument [Member] | Currency exchange rate contracts [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	123	382
Designated as Hedging Instrument [Member] | Currency exchange rate contracts [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	9	143
Designated as Hedging Instrument [Member] | Currency exchange rate contracts [Member] | Other accrued expenses [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	89	12
Designated as Hedging Instrument [Member] | Currency exchange rate contracts [Member] | Other long-term liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	54	3
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	27	119
Liability derivatives	28	30
Not Designated as Hedging Instrument [Member] | Commodity derivatives [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	0
Not Designated as Hedging Instrument [Member] | Commodity derivatives [Member] | Other accrued expenses [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	1
Not Designated as Hedging Instrument [Member] | Currency exchange rate contracts [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	13	119
Not Designated as Hedging Instrument [Member] | Currency exchange rate contracts [Member] | Other accrued expenses [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	23	$ 30
Not Designated as Hedging Instrument [Member] | Cross currency interest rate contracts [Member] | Other assets [Member]
Derivatives, Fair Value [Line Items]
Asset derivatives	14
Not Designated as Hedging Instrument [Member] | Cross currency interest rate contracts [Member] | Other long-term liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability derivatives	$ 4