Financing Arrangements , Long-term Debt (Details) - USD ($) $ in Millions	12 Months Ended
	Apr. 29, 2016	Apr. 24, 2015	Dec. 10, 2014
Debt Instrument [Line Items]
Deferred gains from interest rate swap terminations, net	$ 0	$ 3
Debt premium (discount)	214	499
Total Long-Term Debt	$ 30,247	33,752
Senior notes [Member] | Floating rate three-year 2014 senior notes [Member]
Debt Instrument [Line Items]
Debt term	3 years
Long-term Debt	$ 0	$ 250
Effective Interest Rate	0.00%	0.32%
Senior notes [Member] | 0.875 percent three-year 2014 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	0.875%
Debt term	3 years
Long-term Debt	$ 0	$ 250
Effective Interest Rate	0.00%	0.91%
Senior notes [Member] | 6.000 percent ten-year 2008 CIFSA senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	6.00%
Debt term	10 years
Long-term Debt	$ 1,150	$ 1,150
Effective Interest Rate	1.41%	1.41%
Senior notes [Member] | 1.375 percent five-year 2013 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	1.375%
Debt term	5 years
Long-term Debt	$ 1,000	$ 1,000
Effective Interest Rate	1.41%	1.41%
Senior notes [Member] | 1.500 percent three-year 2015 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	1.50%		1.50%
Debt term	3 years
Long-term Debt	$ 1,000	$ 1,000
Effective Interest Rate	1.59%	1.59%
Senior notes [Member] | 5.600 percent ten-year 2009 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	5.60%
Debt term	10 years
Long-term Debt	$ 400	$ 400
Effective Interest Rate	5.61%	5.61%
Senior notes [Member] | 4.450 percent ten-year 2010 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.45%
Debt term	10 years
Long-term Debt	$ 766	$ 1,250
Effective Interest Rate	4.47%	4.47%
Senior notes [Member] | 2.500 percent five-year 2015 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	2.50%		2.50%
Debt term	5 years
Long-term Debt	$ 2,500	$ 2,500
Effective Interest Rate	2.52%	2.52%
Senior notes [Member] | Floating rate five-year 2015 senior notes [Member]
Debt Instrument [Line Items]
Debt term	5 years
Long-term Debt	$ 500	$ 500
Effective Interest Rate	1.04%	1.04%
Senior notes [Member] | 4.200 percent ten-year 2010 CIFSA senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.20%
Debt term	10 years
Long-term Debt	$ 600	$ 600
Effective Interest Rate	2.22%	2.22%
Senior notes [Member] | 4.125 percent ten-year 2011 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.125%	4.125%
Debt term	10 years
Long-term Debt	$ 500	$ 500
Effective Interest Rate	4.19%	4.19%
Senior notes [Member] | 3.125 percent ten-year 2012 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	3.125%	3.125%
Debt term	10 years
Long-term Debt	$ 675	$ 675
Effective Interest Rate	3.16%	3.16%
Senior notes [Member] | 3.200 percent ten-year 2012 CIFSA senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	3.20%
Debt term	10 years
Long-term Debt	$ 650	$ 650
Effective Interest Rate	2.66%	2.66%
Senior notes [Member] | 3.150 percent seven-year 2015 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	3.15%		3.15%
Debt term	7 years
Long-term Debt	$ 2,500	$ 2,500
Effective Interest Rate	3.18%	3.18%
Senior notes [Member] | 2.750 percent ten-year 2013 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	2.75%
Debt term	10 years
Long-term Debt	$ 530	$ 1,250
Effective Interest Rate	2.78%	2.78%
Senior notes [Member] | 2.950 percent ten-year 2013 CIFSA senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	2.95%
Debt term	10 years
Long-term Debt	$ 310	$ 750
Effective Interest Rate	2.67%	2.67%
Senior notes [Member] | 3.625 percent ten-year 2014 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	3.625%
Debt term	10 years
Long-term Debt	$ 850	$ 850
Effective Interest Rate	3.65%	3.65%
Senior notes [Member] | 3.500 percent ten-year 2015 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	3.50%		3.50%
Debt term	10 years
Long-term Debt	$ 4,000	$ 4,000
Effective Interest Rate	3.61%	3.61%
Senior notes [Member] | 4.375 percent twenty-year 2015 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.375%		4.375%
Debt term	20 years
Long-term Debt	$ 2,382	$ 2,500
Effective Interest Rate	4.44%	4.44%
Senior notes [Member] | 6.550 percent thirty-year 2007 CIFSA senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	6.55%
Debt term	30 years
Long-term Debt	$ 374	$ 850
Effective Interest Rate	3.75%	3.75%
Senior notes [Member] | 6.500 percent thirty-year 2009 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	6.50%
Debt term	30 years
Long-term Debt	$ 300	$ 300
Effective Interest Rate	6.52%	6.52%
Senior notes [Member] | 5.550 percent thirty-year 2010 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	5.55%
Debt term	30 years
Long-term Debt	$ 500	$ 500
Effective Interest Rate	5.56%	5.56%
Senior notes [Member] | 4.500 percent thirty-year 2012 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.50%
Debt term	30 years
Long-term Debt	$ 400	$ 400
Effective Interest Rate	4.51%	4.51%
Senior notes [Member] | 4.000 percent thirty-year 2013 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.00%
Debt term	30 years
Long-term Debt	$ 325	$ 750
Effective Interest Rate	4.12%	4.12%
Senior notes [Member] | 4.625 percent thirty-year 2014 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.625%
Debt term	30 years
Long-term Debt	$ 650	$ 650
Effective Interest Rate	4.67%	4.67%
Senior notes [Member] | 4.625 percent thirty-year 2015 senior notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.625%		4.625%
Debt term	30 years
Long-term Debt	$ 4,000	$ 4,000
Effective Interest Rate	4.64%	4.64%
Senior notes [Member] | Three-year term loan [Member]
Debt Instrument [Line Items]
Debt term	3 years
Long-term Debt	$ 3,000	$ 3,000
Effective Interest Rate	1.12%	1.12%
Interest rate swaps [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 89	$ 79
Capital lease obligations [Member]
Debt Instrument [Line Items]
Capital lease obligations	$ 26	$ 129
Effective Interest Rate	4.66%	3.52%
Bank borrowings [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 56	$ 17
Effective Interest Rate	6.46%