Financing Arrangements - Long-term Debt (Details) - USD ($) $ in Millions	12 Months Ended
Apr. 24, 2020	Apr. 26, 2019
Debt Instrument [Line Items]
Amount	$ 22,140
Debt (discount) premium, net	(15)	$ 29
Finance lease obligations	45
Finance lease obligations		10
Deferred financing costs	(104)	(104)
Long-term debt	$ 22,021	$ 24,486
Effective Interest Rate	8.93%	6.39%
Senior Notes \| 0.000 percent two-year 2019 senior notes
Debt Instrument [Line Items]
Stated interest rate	0.00%
Debt term	2 years
Amount	$ 0	$ 1,681
Effective Interest Rate	0.00%	0.22%
Senior Notes \| Floating rate two-year 2019 senior notes
Debt Instrument [Line Items]
Debt term	2 years
Amount	$ 0	$ 560
Effective Interest Rate	0.00%	0.05%
Senior Notes \| 4.125 percent ten-year 2011 senior notes
Debt Instrument [Line Items]
Stated interest rate	4.125%	4.125%
Debt term	10 years
Amount	$ 0	$ 500
Effective Interest Rate	0.00%	4.21%
Senior Notes \| 3.150 percent seven-year 2015 senior notes
Debt Instrument [Line Items]
Stated interest rate	3.15%
Debt term	7 years
Amount	$ 1,534	$ 2,500
Effective Interest Rate	3.29%	3.29%
Senior Notes \| 3.125 percent ten-year 2012 senior notes
Debt Instrument [Line Items]
Stated interest rate	3.125%	3.125%
Debt term	10 years
Amount	$ 0	$ 675
Effective Interest Rate	0.00%	3.21%
Senior Notes \| 3.200 percent ten-year 2012 CIFSA senior notes
Debt Instrument [Line Items]
Stated interest rate	3.20%
Debt term	10 years
Amount	$ 650	$ 650
Effective Interest Rate	2.72%	2.72%
Senior Notes \| 0.375 percent four-year 2019 senior notes
Debt Instrument [Line Items]
Stated interest rate	0.375%
Debt term	4 years
Amount	$ 1,631	$ 1,681
Effective Interest Rate	0.56%	0.56%
Senior Notes \| 2.750 percent ten-year 2013 senior notes
Debt Instrument [Line Items]
Stated interest rate	2.75%
Debt term	10 years
Amount	$ 530	$ 530
Effective Interest Rate	3.25%	3.25%
Senior Notes \| 0.000 percent four-year 2019 senior notes
Debt Instrument [Line Items]
Stated interest rate	0.00%
Debt term	4 years
Amount	$ 815	$ 0
Effective Interest Rate	0.09%	0.00%
Senior Notes \| 2.950 percent ten-year 2013 CIFSA senior notes
Debt Instrument [Line Items]
Stated interest rate	2.95%
Debt term	10 years
Amount	$ 310	$ 310
Effective Interest Rate	2.71%	2.71%
Senior Notes \| 3.625 percent ten-year 2014 senior notes
Debt Instrument [Line Items]
Stated interest rate	3.625%
Debt term	10 years
Amount	$ 432	$ 850
Effective Interest Rate	3.61%	3.61%
Senior Notes \| 3.500 percent ten-year 2015 senior notes
Debt Instrument [Line Items]
Stated interest rate	3.50%
Debt term	10 years
Amount	$ 2,700	$ 4,000
Effective Interest Rate	3.74%	3.74%
Senior Notes \| 0.250 percent seven-year 2019 senior notes
Debt Instrument [Line Items]
Stated interest rate	0.25%
Debt term	7 years
Amount	$ 1,087	$ 0
Effective Interest Rate	0.44%	0.00%
Senior Notes \| 1.125 percent eight-year 2019 senior notes
Debt Instrument [Line Items]
Stated interest rate	1.125%
Debt term	8 years
Amount	$ 1,631	$ 1,681
Effective Interest Rate	1.25%	1.25%
Senior Notes \| 3.350 percent ten-year 2017 senior notes
Debt Instrument [Line Items]
Stated interest rate	3.35%
Debt term	10 years
Amount	$ 368	$ 850
Effective Interest Rate	3.53%	3.53%
Senior Notes \| 1.625 percent twelve-year 2019 senior notes
Debt Instrument [Line Items]
Stated interest rate	1.625%
Debt term	12 years
Amount	$ 1,087	$ 1,121
Effective Interest Rate	1.75%	1.75%
Senior Notes \| 1.000 percent thirteen-year 2019 senior notes
Debt Instrument [Line Items]
Stated interest rate	1.00%
Debt term	13 years
Amount	$ 1,087	$ 0
Effective Interest Rate	1.06%	0.00%
Senior Notes \| 4.375 percent twenty-year 2015 senior notes
Debt Instrument [Line Items]
Stated interest rate	4.375%
Debt term	20 years
Amount	$ 1,932	$ 2,382
Effective Interest Rate	4.47%	4.47%
Senior Notes \| 6.550 percent thirty-year 2007 CIFSA senior notes
Debt Instrument [Line Items]
Stated interest rate	6.55%
Debt term	30 years
Amount	$ 253	$ 284
Effective Interest Rate	4.68%	4.68%
Senior Notes \| 2.250 percent twenty-year 2019 senior notes
Debt Instrument [Line Items]
Stated interest rate	2.25%
Debt term	20 years
Amount	$ 1,087	$ 1,121
Effective Interest Rate	2.34%	2.34%
Senior Notes \| 6.500 percent thirty-year 2009 senior notes
Debt Instrument [Line Items]
Stated interest rate	6.50%
Debt term	30 years
Amount	$ 158	$ 183
Effective Interest Rate	6.56%	6.56%
Senior Notes \| 5.550 percent thirty-year 2010 senior notes
Debt Instrument [Line Items]
Stated interest rate	5.55%
Debt term	30 years
Amount	$ 224	$ 306
Effective Interest Rate	5.58%	5.58%
Senior Notes \| 1.500 percent twenty-year 2019 senior notes
Debt Instrument [Line Items]
Stated interest rate	1.50%
Debt term	20 years
Amount	$ 1,087	$ 0
Effective Interest Rate	1.58%	0.00%
Senior Notes \| 4.500 percent thirty-year 2012 senior notes
Debt Instrument [Line Items]
Stated interest rate	4.50%
Debt term	30 years
Amount	$ 105	$ 129
Effective Interest Rate	4.54%	4.54%
Senior Notes \| 4.000 percent thirty-year 2013 senior notes
Debt Instrument [Line Items]
Stated interest rate	4.00%
Debt term	30 years
Amount	$ 305	$ 325
Effective Interest Rate	4.10%	4.10%
Senior Notes \| 4.625 percent thirty-year 2014 senior notes
Debt Instrument [Line Items]
Stated interest rate	4.625%
Debt term	30 years
Amount	$ 127	$ 177
Effective Interest Rate	4.67%	4.67%
Senior Notes \| 4.625 percent thirty-year 2015 senior notes
Debt Instrument [Line Items]
Stated interest rate	4.625%
Debt term	30 years
Amount	$ 1,813	$ 1,963
Effective Interest Rate	4.67%	4.69%
Senior Notes \| 1.750 percent thirty-year 2019 senior notes
Debt Instrument [Line Items]
Stated interest rate	1.75%
Debt term	30 years
Amount	$ 1,087	$ 0
Effective Interest Rate	1.87%	0.00%
Bank borrowings
Debt Instrument [Line Items]
Amount	$ 55	$ 83
Effective Interest Rate	2.11%	1.94%
Interest rate swaps
Debt Instrument [Line Items]
Interest rate swaps	$ 0	$ 9

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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