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Retirement Benefit Plans , Other Disclosures (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended
Apr. 26, 2013
Apr. 27, 2012
Apr. 29, 2011
Apr. 30, 2010
Apr. 26, 2013
PIA
Apr. 27, 2012
PIA
Apr. 29, 2011
PIA
Apr. 26, 2013
U.S. Pension Benefits
Apr. 27, 2012
U.S. Pension Benefits
Apr. 29, 2011
U.S. Pension Benefits
May 01, 2005
U.S. Pension Benefits
plan
Apr. 26, 2013
U.S. Pension Benefits
Minimum
Apr. 26, 2013
Post-Retirement Benefits
Apr. 27, 2012
Post-Retirement Benefits
Apr. 29, 2011
Post-Retirement Benefits
Retirement Benefit Plans Disclosure                              
Defined Benefit Plan, Funded Percentage                       80.00%      
Cost of retirement benefit plans $ 419 $ 319 $ 368         $ 140 $ 102 $ 103     $ 20 $ 23 $ 28
Underfunded status of the plan (584) (621)           (437) (407)       (69) (135)  
Non-cash charge due to PPACA and Reconciliation Act       15                      
Plan funded percentage description in excess of 80 percent                            
Expected decline in healthcare cost trend rates of 5 year period the trend rates are expected to decline to 5.0 percent over a five-year period                            
Decline in ultimate health care cost trend rate                         5.00%    
Period of ultimate trend rate                         5 years    
Defined Contribution Savings Plan                              
Expense under defined contribution plans $ 163 $ 106 $ 147   $ 50 $ 48 $ 46                
Number of new plans created                     2        
Treasury bond rate of guaranteed rate of return 10 years