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Financing Arrangements , Long-Term Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Jul. 31, 2015
Apr. 24, 2015
Debt Instrument [Line Items]    
Deferred gains from interest rate swap terminations, net $ (1) $ (3)
Debt premium (458) (499)
Long-term debt $ 33,709 33,752
Senior Notes [Member] | Senior Notes 2014 Due 2017 Floating [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Term 3 years  
Long-term Debt $ 250 250
Senior Notes [Member] | Senior Notes 2014 Due 2017 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 0.875%  
Debt Instrument, Term 3 years  
Long-term Debt $ 250 250
Senior Notes [Member] | Senior Notes CIFSA Ten Year 2008 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 6.00%  
Debt Instrument, Term 10 years  
Long-term Debt $ 1,150 1,150
Senior Notes [Member] | Senior Notes 2015 Due 2018 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 1.50%  
Debt Instrument, Term 3 years  
Long-term Debt $ 1,000 1,000
Senior Notes [Member] | Senior Notes 2013 Due 2018 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 1.375%  
Debt Instrument, Term 5 years  
Long-term Debt $ 1,000 1,000
Senior Notes [Member] | Senior Notes 2009 Due 2019 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 5.60%  
Debt Instrument, Term 10 years  
Long-term Debt $ 400 400
Senior Notes [Member] | Senior Notes 2010 Due 2020 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 4.45%  
Debt Instrument, Term 10 years  
Long-term Debt $ 1,250 1,250
Senior Notes [Member] | Senior Notes CIFSA 2010 Due 2020 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 4.20%  
Debt Instrument, Term 10 years  
Long-term Debt $ 600 600
Senior Notes [Member] | Senior Notes 2015 Due 2020 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 2.50%  
Debt Instrument, Term 5 years  
Long-term Debt $ 2,500 2,500
Senior Notes [Member] | Senior Notes 2015 Due 2020 Floating [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Term 5 years  
Long-term Debt $ 500 500
Senior Notes [Member] | Senior Notes 2011 Due 2021 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 4.125%  
Debt Instrument, Term 10 years  
Long-term Debt $ 500 500
Senior Notes [Member] | Senior Notes 2012 Due 2022 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 3.125%  
Debt Instrument, Term 10 years  
Long-term Debt $ 675 675
Senior Notes [Member] | Senior Notes CIFSA 2012 Due 2022 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 3.20%  
Debt Instrument, Term 10 years  
Long-term Debt $ 650 650
Senior Notes [Member] | Senior Notes 2015 Due 2022 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 3.15%  
Debt Instrument, Term 7 years  
Long-term Debt $ 2,500 2,500
Senior Notes [Member] | Senior Notes 2013 Due 2023 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 2.75%  
Debt Instrument, Term 10 years  
Long-term Debt $ 1,250 1,250
Senior Notes [Member] | Senior Notes CIFSA 2013 Due 2023 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 2.95%  
Debt Instrument, Term 10 years  
Long-term Debt $ 750 750
Senior Notes [Member] | Senior Notes 2014 Due 2024 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 3.625%  
Debt Instrument, Term 10 years  
Long-term Debt $ 850 850
Senior Notes [Member] | Senior Notes 2015 Due 2025 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 3.50%  
Debt Instrument, Term 10 years  
Long-term Debt $ 4,000 4,000
Senior Notes [Member] | Senior Notes 2015 Due 2035 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 4.375%  
Debt Instrument, Term 20 years  
Long-term Debt $ 2,500 2,500
Senior Notes [Member] | Senior Notes 2009 Due 2039 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 6.50%  
Debt Instrument, Term 30 years  
Long-term Debt $ 300 300
Senior Notes [Member] | Senior Notes 2010 Due 2040 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 5.55%  
Debt Instrument, Term 30 years  
Long-term Debt $ 500 500
Senior Notes [Member] | Senior Notes 2012 Due 2042 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 4.50%  
Debt Instrument, Term 30 years  
Long-term Debt $ 400 400
Senior Notes [Member] | Senior Notes 2013 Due 2043 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 4.00%  
Debt Instrument, Term 30 years  
Long-term Debt $ 750 750
Senior Notes [Member] | Senior Notes 2014 Due 2044 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 4.625%  
Debt Instrument, Term 30 years  
Long-term Debt $ 650 650
Senior Notes [Member] | Senior Notes 2015 Due 2045 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 4.625%  
Debt Instrument, Term 30 years  
Long-term Debt $ 4,000 4,000
Senior Notes [Member] | Three Year Term Loan [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Term 3 years  
Long-term Debt $ 3,000 3,000
Senior Notes [Member] | Senior Notes CIFSA Due 2037 [Member]    
Debt Instrument [Line Items]    
Stated interest rate 6.55%  
Debt Instrument, Term 30 years  
Long-term Debt $ 850 850
Interest Rate Swap    
Debt Instrument [Line Items]    
Long-term Debt 62 79
Capital Lease Obligations [Member]    
Debt Instrument [Line Items]    
Capital lease obligations 125 129
Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Long-term Debt $ 38 $ 17