Financing Arrangements - Long-Term Debt (Details) - USD ($) $ in Millions	3 Months Ended
Jul. 31, 2020	Apr. 24, 2020
Debt Instrument [Line Items]
Current debt obligations	$ 5,823	$ 2,776
Long-term debt
Debt discount, net	(14)	(15)
Finance lease obligations	45	45
Deferred financing costs	(99)	(104)
Long-term debt	$ 22,867	22,021
Senior notes \| 3.150 percent seven-year 2015 senior notes
Long-term debt
Stated interest rate	3.15%
Term of debt instrument	7 years
Long-term debt, gross	$ 1,534	1,534
Senior notes \| 3.200 percent ten-year 2012 senior notes
Long-term debt
Stated interest rate	3.20%
Term of debt instrument	10 years
Long-term debt, gross	$ 650	650
Senior notes \| 0.375 percent four-year 2019 senior notes
Long-term debt
Stated interest rate	0.375%
Term of debt instrument	4 years
Long-term debt, gross	$ 1,762	1,631
Senior notes \| 2.750 percent ten-year 2013 senior notes
Long-term debt
Stated interest rate	2.75%
Term of debt instrument	10 years
Long-term debt, gross	$ 530	530
Senior notes \| 0.000 percent four-year 2019 senior notes
Long-term debt
Stated interest rate	0.00%
Term of debt instrument	4 years
Long-term debt, gross	$ 881	815
Senior notes \| 2.950 percent ten-year 2013 senior notes
Long-term debt
Stated interest rate	2.95%
Term of debt instrument	10 years
Long-term debt, gross	$ 310	310
Senior notes \| 3.625 percent ten-year 2014 senior notes
Long-term debt
Stated interest rate	3.625%
Term of debt instrument	10 years
Long-term debt, gross	$ 432	432
Senior notes \| 3.500 percent ten-year 2015 senior notes
Long-term debt
Stated interest rate	3.50%
Term of debt instrument	10 years
Long-term debt, gross	$ 2,700	2,700
Senior notes \| 0.250 percent seven-year 2019 senior notes
Long-term debt
Stated interest rate	0.25%
Term of debt instrument	7 years
Long-term debt, gross	$ 1,175	1,087
Senior notes \| 1.125 percent eight-year 2019 senior notes
Long-term debt
Stated interest rate	1.125%
Term of debt instrument	8 years
Long-term debt, gross	$ 1,762	1,631
Senior notes \| 3.350 percent ten-year 2017 senior notes
Long-term debt
Stated interest rate	3.35%
Term of debt instrument	10 years
Long-term debt, gross	$ 368	368
Senior notes \| 1.625 percent twelve-year 2019 senior notes
Long-term debt
Stated interest rate	1.625%
Term of debt instrument	12 years
Long-term debt, gross	$ 1,175	1,087
Senior notes \| 1.000 percent thirteen-year 2019 senior notes
Long-term debt
Stated interest rate	1.00%
Term of debt instrument	13 years
Long-term debt, gross	$ 1,175	1,087
Senior notes \| 4.375 percent twenty-year 2015 senior notes
Long-term debt
Stated interest rate	4.375%
Term of debt instrument	20 years
Long-term debt, gross	$ 1,932	1,932
Senior notes \| 6.550 percent thirty-year 2007 senior notes
Long-term debt
Stated interest rate	6.55%
Term of debt instrument	30 years
Long-term debt, gross	$ 253	253
Senior notes \| 2.250 percent twenty-year 2019 senior notes
Long-term debt
Stated interest rate	2.25%
Term of debt instrument	20 years
Long-term debt, gross	$ 1,175	1,087
Senior notes \| 6.500 percent thirty-year 2009 senior notes
Long-term debt
Stated interest rate	6.50%
Term of debt instrument	30 years
Long-term debt, gross	$ 158	158
Senior notes \| 5.550 percent thirty-year 2010 senior notes
Long-term debt
Stated interest rate	5.55%
Term of debt instrument	30 years
Long-term debt, gross	$ 224	224
Senior notes \| 1.500 percent twenty-year 2019 senior notes
Long-term debt
Stated interest rate	1.50%
Term of debt instrument	20 years
Long-term debt, gross	$ 1,175	1,087
Senior notes \| 4.500 percent thirty-year 2012 senior notes
Long-term debt
Stated interest rate	4.50%
Term of debt instrument	30 years
Long-term debt, gross	$ 105	105
Senior notes \| 4.000 percent thirty-year 2013 senior notes
Long-term debt
Stated interest rate	4.00%
Term of debt instrument	30 years
Long-term debt, gross	$ 305	305
Senior notes \| 4.625 percent thirty-year 2014 senior notes
Long-term debt
Stated interest rate	4.625%
Term of debt instrument	30 years
Long-term debt, gross	$ 127	127
Senior notes \| 4.625 percent thirty-year 2015 senior notes
Long-term debt
Stated interest rate	4.625%
Term of debt instrument	30 years
Long-term debt, gross	$ 1,813	1,813
Senior notes \| 1.750 percent thirty-year 2019 senior notes
Long-term debt
Stated interest rate	1.75%
Term of debt instrument	30 years
Long-term debt, gross	$ 1,175	1,087
Bank borrowings
Long-term debt
Long-term debt, gross	$ 39	$ 55

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