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Financing Arrangements - Long-Term Debt (Details) - USD ($) $ in Millions	9 Months Ended
	Jan. 29, 2016	Apr. 24, 2015
Debt Instrument [Line Items]
Deferred gains from interest rate swap terminations, net	$ 0	$ 3
Debt premium	421	499
Total Long-Term Debt	$ 33,681	33,752
Senior notes [Member] | Floating rate three-year 2014 senior notes [Member]
Debt Instrument [Line Items]
Term of debt instrument	3 years
Long-term Debt	$ 250	250
Senior notes [Member] | 0.875 percent three-year 2014 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	0.875%
Term of debt instrument	3 years
Long-term Debt	$ 250	250
Senior notes [Member] | 6.000 percent ten-year 2008 CIFSA senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	6.00%
Term of debt instrument	10 years
Long-term Debt	$ 1,150	1,150
Senior notes [Member] | 1.500 percent three-year 2015 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	1.50%
Term of debt instrument	3 years
Long-term Debt	$ 1,000	1,000
Senior notes [Member] | 1.375 percent five-year 2013 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	1.375%
Term of debt instrument	5 years
Long-term Debt	$ 1,000	1,000
Senior notes [Member] | 5.600 percent ten-year 2009 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	5.60%
Term of debt instrument	10 years
Long-term Debt	$ 400	400
Senior notes [Member] | 4.450 percent ten-year 2010 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.45%
Term of debt instrument	10 years
Long-term Debt	$ 1,250	1,250
Senior notes [Member] | 2.500 percent five-year 2015 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	2.50%
Term of debt instrument	5 years
Long-term Debt	$ 2,500	2,500
Senior notes [Member] | Floating rate five-year 2015 senior notes [Member]
Debt Instrument [Line Items]
Term of debt instrument	5 years
Long-term Debt	$ 500	500
Senior notes [Member] | 4.200 percent ten-year 2010 CIFSA senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.20%
Term of debt instrument	10 years
Long-term Debt	$ 600	600
Senior notes [Member] | 4.125 percent ten-year 2011 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.125%
Term of debt instrument	10 years
Long-term Debt	$ 500	500
Senior notes [Member] | 3.125 percent ten-year 2012 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	3.125%
Term of debt instrument	10 years
Long-term Debt	$ 675	675
Senior notes [Member] | 3.150 percent seven-year 2015 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	3.15%
Term of debt instrument	7 years
Long-term Debt	$ 2,500	2,500
Senior notes [Member] | 3.200 percent ten-year 2012 CIFSA senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	3.20%
Term of debt instrument	10 years
Long-term Debt	$ 650	650
Senior notes [Member] | 2.750 percent ten-year 2013 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	2.75%
Term of debt instrument	10 years
Long-term Debt	$ 1,250	1,250
Senior notes [Member] | 2.950 percent ten-year 2013 CIFSA senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	2.95%
Term of debt instrument	10 years
Long-term Debt	$ 750	750
Senior notes [Member] | 3.625 percent ten-year 2014 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	3.625%
Term of debt instrument	10 years
Long-term Debt	$ 850	850
Senior notes [Member] | 3.500 percent ten-year 2015 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	3.50%
Term of debt instrument	10 years
Long-term Debt	$ 4,000	4,000
Senior notes [Member] | 4.375 percent twenty-year 2015 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.375%
Term of debt instrument	20 years
Long-term Debt	$ 2,500	2,500
Senior notes [Member] | 6.550 percent thirty-year 2008 CIFSA senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	6.55%
Term of debt instrument	30 years
Long-term Debt	$ 850	850
Senior notes [Member] | 6.500 percent thirty-year 2009 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	6.50%
Term of debt instrument	30 years
Long-term Debt	$ 300	300
Senior notes [Member] | 5.550 percent thirty-year 2010 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	5.55%
Term of debt instrument	30 years
Long-term Debt	$ 500	500
Senior notes [Member] | 4.500 percent thirty-year 2012 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.50%
Term of debt instrument	30 years
Long-term Debt	$ 400	400
Senior notes [Member] | 4.000 percent thirty-year 2013 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.00%
Term of debt instrument	30 years
Long-term Debt	$ 750	750
Senior notes [Member] | 4.625 percent thirty-year 2014 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.625%
Term of debt instrument	30 years
Long-term Debt	$ 650	650
Senior notes [Member] | 4.625 percent thirty-year 2015 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.625%
Term of debt instrument	30 years
Long-term Debt	$ 4,000	4,000
Senior notes [Member] | Three-year term loan [Member]
Debt Instrument [Line Items]
Term of debt instrument	3 years
Long-term Debt	$ 3,000	3,000
Interest rate swaps [Member]
Debt Instrument [Line Items]
Long-term Debt	87	79
Capital lease obligations [Member]
Debt Instrument [Line Items]
Capital lease obligations	117	129
Bank borrowings [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 31	$ 17

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