Financing Arrangements , Long-term Debt (Details)	12 Months Ended
	Apr. 28, 2017 USD ($)	Mar. 31, 2017 USD ($) tranche	Apr. 29, 2016 USD ($)
Debt Instrument [Line Items]
Debt premium, net	$ 135,000,000		$ 214,000,000
Deferred financing costs	(128,000,000)		(138,000,000)
Long-term debt	$ 25,921,000,000		30,109,000,000
Three-year term loan
Debt Instrument [Line Items]
Debt term	3 years
Long-term debt	$ 0		$ 3,000,000,000
Effective Interest Rate	0.00%		1.12%
Senior notes | 6.000 percent ten-year 2008 CIFSA senior notes
Debt Instrument [Line Items]
Stated interest rate	6.00%
Debt term	10 years
Long-term debt	$ 0		$ 1,150,000,000
Effective Interest Rate	1.41%		1.41%
Senior notes | 1.375 percent five-year 2013 senior notes
Debt Instrument [Line Items]
Stated interest rate	1.375%
Debt term	5 years
Long-term debt	$ 0		$ 1,000,000,000
Effective Interest Rate	1.41%		1.41%
Senior notes | 1.500 percent three-year 2015 senior notes
Debt Instrument [Line Items]
Stated interest rate	1.50%
Debt term	3 years
Long-term debt	$ 0		$ 1,000,000,000
Effective Interest Rate	1.59%		1.59%
Senior notes | 5.600 percent ten-year 2009 senior notes
Debt Instrument [Line Items]
Stated interest rate	5.60%
Debt term	10 years
Long-term debt	$ 400,000,000		$ 400,000,000
Effective Interest Rate	5.61%		5.61%
Senior notes | 1.700 percent two-year 2017 senior notes
Debt Instrument [Line Items]
Stated interest rate	1.70%	1.70%
Debt term	2 years
Long-term debt	$ 1,000,000,000		$ 0
Effective Interest Rate	1.74%		0.00%
Face value		$ 1,000,000,000
Senior notes | 4.450 percent ten-year 2010 senior notes
Debt Instrument [Line Items]
Stated interest rate	4.45%
Debt term	10 years
Long-term debt	$ 766,000,000		$ 766,000,000
Effective Interest Rate	4.47%		4.47%
Senior notes | 2.500 percent five-year 2015 senior notes
Debt Instrument [Line Items]
Stated interest rate	2.50%
Debt term	5 years
Long-term debt	$ 2,500,000,000		$ 2,500,000,000
Effective Interest Rate	2.52%		2.52%
Senior notes | Floating rate five-year 2015 senior notes
Debt Instrument [Line Items]
Debt term	5 years
Long-term debt	$ 500,000,000		$ 500,000,000
Effective Interest Rate	1.98%		1.04%
Senior notes | 4.200 percent ten-year 2010 CIFSA senior notes
Debt Instrument [Line Items]
Stated interest rate	4.20%
Debt term	10 years
Long-term debt	$ 600,000,000		$ 600,000,000
Effective Interest Rate	2.22%		2.22%
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
Long-term debt	$ 500,000,000		$ 500,000,000
Effective Interest Rate	4.19%		4.19%
Face value	$ 500,000,000		$ 500,000,000
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
Long-term debt	$ 675,000,000		$ 675,000,000
Effective Interest Rate	3.16%		3.16%
Face value	$ 675,000,000		$ 675,000,000
Senior notes | 3.150 percent seven-year 2015 senior notes
Debt Instrument [Line Items]
Stated interest rate	3.15%
Debt term	7 years
Long-term debt	$ 2,500,000,000		$ 2,500,000,000
Effective Interest Rate	3.18%		3.18%
Senior notes | 3.200 percent ten-year 2012 CIFSA senior notes
Debt Instrument [Line Items]
Stated interest rate	3.20%
Debt term	10 years
Long-term debt	$ 650,000,000		$ 650,000,000
Effective Interest Rate	2.66%		2.66%
Senior notes | 2.750 percent ten-year 2013 senior notes
Debt Instrument [Line Items]
Stated interest rate	2.75%
Debt term	10 years
Long-term debt	$ 530,000,000		$ 530,000,000
Effective Interest Rate	2.78%		2.78%
Senior notes | 2.950 percent ten-year 2013 CIFSA senior notes
Debt Instrument [Line Items]
Stated interest rate	2.95%
Debt term	10 years
Long-term debt	$ 310,000,000		$ 310,000,000
Effective Interest Rate	2.67%		2.67%
Senior notes | 3.625 percent ten-year 2014 senior notes
Debt Instrument [Line Items]
Stated interest rate	3.625%
Debt term	10 years
Long-term debt	$ 850,000,000		$ 850,000,000
Effective Interest Rate	3.65%		3.65%
Senior notes | 3.500 percent ten-year 2015 senior notes
Debt Instrument [Line Items]
Stated interest rate	3.50%
Debt term	10 years
Long-term debt	$ 4,000,000,000		$ 4,000,000,000
Effective Interest Rate	3.61%		3.61%
Senior notes | 3.350 percent ten-year 2017 senior notes
Debt Instrument [Line Items]
Stated interest rate	3.35%	3.35%
Debt term	10 years
Long-term debt	$ 850,000,000		$ 0
Effective Interest Rate	3.35%		0.00%
Face value		$ 850,000,000
Senior notes | 4.375 percent twenty-year 2015 senior notes
Debt Instrument [Line Items]
Stated interest rate	4.375%
Debt term	20 years
Long-term debt	$ 2,382,000,000		$ 2,382,000,000
Effective Interest Rate	4.44%		4.44%
Senior notes | 6.550 percent thirty-year 2007 CIFSA senior notes
Debt Instrument [Line Items]
Stated interest rate	6.55%
Debt term	30 years
Long-term debt	$ 374,000,000		$ 374,000,000
Effective Interest Rate	3.75%		3.75%
Senior notes | 6.500 percent thirty-year 2009 senior notes
Debt Instrument [Line Items]
Stated interest rate	6.50%
Debt term	30 years
Long-term debt	$ 300,000,000		$ 300,000,000
Effective Interest Rate	6.52%		6.52%
Senior notes | 5.550 percent thirty-year 2010 senior notes
Debt Instrument [Line Items]
Stated interest rate	5.55%
Debt term	30 years
Long-term debt	$ 500,000,000		$ 500,000,000
Effective Interest Rate	5.56%		5.56%
Senior notes | 4.500 percent thirty-year 2012 senior notes
Debt Instrument [Line Items]
Stated interest rate	4.50%
Debt term	30 years
Long-term debt	$ 400,000,000		$ 400,000,000
Effective Interest Rate	4.51%		4.51%
Senior notes | 4.000 percent thirty-year 2013 senior notes
Debt Instrument [Line Items]
Stated interest rate	4.00%
Debt term	30 years
Long-term debt	$ 325,000,000		$ 325,000,000
Effective Interest Rate	4.12%		4.12%
Senior notes | 4.625 percent thirty-year 2014 senior notes
Debt Instrument [Line Items]
Stated interest rate	4.625%
Debt term	30 years
Long-term debt	$ 650,000,000		$ 650,000,000
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%	4.625%
Debt term	30 years
Long-term debt	$ 4,150,000,000		$ 4,000,000,000
Effective Interest Rate	4.62%		4.64%
Face value		$ 4,000,000,000
Senior notes | 2017 Senior Notes
Debt Instrument [Line Items]
Number of tranches | tranche		2
Face value		$ 1,850,000,000
Senior notes | Senior Notes 2017 Due 2045
Debt Instrument [Line Items]
Stated interest rate		4.625%
Face value		$ 150,000,000
Interest rate swaps
Debt Instrument [Line Items]
Long-term debt	$ 40,000,000		$ 89,000,000
Capital lease obligations
Debt Instrument [Line Items]
Capital lease obligations	$ 23,000,000		$ 26,000,000
Effective Interest Rate	4.81%		4.66%
Bank borrowings
Debt Instrument [Line Items]
Long-term debt	$ 139,000,000		$ 56,000,000
Effective Interest Rate	1.28%		6.46%