Financing Arrangements - Long-Term Debt (Details) - USD ($) $ in Millions	9 Months Ended
	Jan. 28, 2022	Apr. 30, 2021
Debt Instrument [Line Items]
Current debt obligations	$ 865	$ 11
Long-term debt
Finance lease obligations	58	62
Deferred financing costs	(113)	(125)
Debt discount, net	(61)	(75)
Long-term debt	$ 24,290	26,378
0.000 percent three-year 2019 senior notes
Long-term debt
Stated interest rate	0.00%
Term of debt instrument	3 years
0.375 percent four-year 2019 senior notes
Long-term debt
Stated interest rate	0.375%
Term of debt instrument	4 years
0.000 percent two-year 2020 senior notes
Long-term debt
Stated interest rate	0.00%
Term of debt instrument	2 years
3.500 percent ten-year 2015 senior notes
Long-term debt
Stated interest rate	3.50%
Term of debt instrument	10 years
0.250 percent six-year 2019 senior notes
Long-term debt
Stated interest rate	0.25%
Term of debt instrument	6 years
0.000 percent five-year 2020 senior notes
Long-term debt
Stated interest rate	0.00%
Term of debt instrument	5 years
1.125 percent eight-year 2019 senior notes
Long-term debt
Stated interest rate	1.125%
Term of debt instrument	8 years
3.350 percent ten-year 2017 senior notes
Long-term debt
Stated interest rate	3.35%
Term of debt instrument	10 years
0.375 percent eight-year 2020 senior notes
Long-term debt
Stated interest rate	0.375%
Term of debt instrument	8 years
1.625 percent twelve-year 2019 senior notes
Long-term debt
Stated interest rate	1.625%
Term of debt instrument	12 years
1.000 percent twelve-year 2019 senior notes
Long-term debt
Stated interest rate	1.00%
Term of debt instrument	12 years
0.750 percent twelve-year 2020 senior notes
Long-term debt
Stated interest rate	0.75%
Term of debt instrument	12 years
4.375 percent twenty-year 2015 senior notes
Long-term debt
Stated interest rate	4.375%
Term of debt instrument	20 years
6.550 percent thirty-year 2007 CIFSA senior notes
Long-term debt
Stated interest rate	6.55%
Term of debt instrument	30 years
2.250 percent twenty-year 2019 senior notes
Long-term debt
Stated interest rate	2.25%
Term of debt instrument	20 years
6.500 percent thirty-year 2009 senior notes
Long-term debt
Stated interest rate	6.50%
Term of debt instrument	30 years
1.500 percent twenty-year 2019 senior notes
Long-term debt
Stated interest rate	1.50%
Term of debt instrument	20 years
5.550 percent thirty-year 2010 senior notes
Long-term debt
Stated interest rate	5.55%
Term of debt instrument	30 years
1.375 percent twenty-year 2020 senior notes
Long-term debt
Stated interest rate	1.375%
Term of debt instrument	20 years
4.500 percent thirty-year 2012 senior notes
Long-term debt
Stated interest rate	4.50%
Term of debt instrument	30 years
4.000 percent thirty-year 2013 senior notes
Long-term debt
Stated interest rate	4.00%
Term of debt instrument	30 years
4.625 percent thirty-year 2014 senior notes
Long-term debt
Stated interest rate	4.625%
Term of debt instrument	30 years
4.625 percent thirty-year 2015 senior notes
Long-term debt
Stated interest rate	4.625%
Term of debt instrument	30 years
1.750 percent thirty-year 2019 senior notes
Long-term debt
Stated interest rate	1.75%
Term of debt instrument	30 years
1.625 percent thirty-year 2020 senior notes
Long-term debt
Stated interest rate	1.625%
Term of debt instrument	30 years
Senior notes | 0.000 percent three-year 2019 senior notes
Long-term debt
Long-term debt, gross	$ 0	907
Senior notes | 0.375 percent four-year 2019 senior notes
Long-term debt
Long-term debt, gross	1,695	1,813
Senior notes | 0.000 percent two-year 2020 senior notes
Long-term debt
Long-term debt, gross	1,412	1,511
Senior notes | 3.500 percent ten-year 2015 senior notes
Long-term debt
Long-term debt, gross	1,890	1,890
Senior notes | 0.250 percent six-year 2019 senior notes
Long-term debt
Long-term debt, gross	1,130	1,209
Senior notes | 0.000 percent five-year 2020 senior notes
Long-term debt
Long-term debt, gross	1,130	1,209
Senior notes | 1.125 percent eight-year 2019 senior notes
Long-term debt
Long-term debt, gross	1,695	1,813
Senior notes | 3.350 percent ten-year 2017 senior notes
Long-term debt
Long-term debt, gross	368	368
Senior notes | 0.375 percent eight-year 2020 senior notes
Long-term debt
Long-term debt, gross	1,130	1,209
Senior notes | 1.625 percent twelve-year 2019 senior notes
Long-term debt
Long-term debt, gross	1,130	1,209
Senior notes | 1.000 percent twelve-year 2019 senior notes
Long-term debt
Long-term debt, gross	1,130	1,209
Senior notes | 0.750 percent twelve-year 2020 senior notes
Long-term debt
Long-term debt, gross	1,130	1,209
Senior notes | 4.375 percent twenty-year 2015 senior notes
Long-term debt
Long-term debt, gross	1,932	1,932
Senior notes | 6.550 percent thirty-year 2007 CIFSA senior notes
Long-term debt
Long-term debt, gross	253	253
Senior notes | 2.250 percent twenty-year 2019 senior notes
Long-term debt
Long-term debt, gross	1,130	1,209
Senior notes | 6.500 percent thirty-year 2009 senior notes
Long-term debt
Long-term debt, gross	158	158
Senior notes | 1.500 percent twenty-year 2019 senior notes
Long-term debt
Long-term debt, gross	1,130	1,209
Senior notes | 5.550 percent thirty-year 2010 senior notes
Long-term debt
Long-term debt, gross	224	224
Senior notes | 1.375 percent twenty-year 2020 senior notes
Long-term debt
Long-term debt, gross	1,130	1,209
Senior notes | 4.500 percent thirty-year 2012 senior notes
Long-term debt
Long-term debt, gross	105	105
Senior notes | 4.000 percent thirty-year 2013 senior notes
Long-term debt
Long-term debt, gross	305	305
Senior notes | 4.625 percent thirty-year 2014 senior notes
Long-term debt
Long-term debt, gross	127	127
Senior notes | 4.625 percent thirty-year 2015 senior notes
Long-term debt
Long-term debt, gross	1,813	1,813
Senior notes | 1.750 percent thirty-year 2019 senior notes
Long-term debt
Long-term debt, gross	1,130	1,209
Senior notes | 1.625 percent thirty-year 2020 senior notes
Long-term debt
Long-term debt, gross	$ 1,130	$ 1,209