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Fair Value Measurements , Fair Value Measured on Nonrecurring Basis and Financial Instruments Not Measured at Fair Value (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Apr. 26, 2013
Apr. 27, 2012
Apr. 29, 2011
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis      
Aggregate carrying amount of investments in equity and other securities that are accounted for using the cost or equity method $ 549 $ 508  
Aggregate carrying amount of intangible assets 2,673 2,647  
Carrying amount of goodwill 10,329 9,934 9,520
Carrying amount of IPR&D 363 370  
Acquisition Related (Gains) Charges (49) 12 14
Financial Instruments Not Measured at Fair Value      
Long-term debt, fair value 10,820 9,965  
Long-term debt, principal value 9,928 9,138  
Nonrecurring
     
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis      
Aggregate carrying amount of investments in equity and other securities that are accounted for using the cost or equity method 549 508  
Cost-method investment impairment charges 21 10 24
Aggregate carrying amount of intangible assets 2,310 2,277  
Intangible assets measured on a nonrecurring basis as a percentage of total intangible assets, maximum 5.00% 5.00%  
Impairment of Intangible Assets, Finite-lived 2    
Impairment loss of intangilble assets     28
Property, plant and equipment impairments 6 9 13
Nonrecurring | Restructuring Charges, Net
     
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis      
Impairment loss of intangilble assets   19  
Nonrecurring | Other Expense, Net
     
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis      
Impairment loss of intangilble assets   9  
Impairment of Acquired in Process Research and Development
     
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis      
Acquisition Related (Gains) Charges $ 5