v2.4.0.6
Pension, Retiree Medical and Savings Plans (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 29, 2012
Dec. 29, 2012
Discretionary [Member]
Sep. 04, 2010
Retiree Medical Plan [Member]
Dec. 29, 2012
Retiree Medical Plan [Member]
Dec. 31, 2011
Retiree Medical Plan [Member]
Dec. 29, 2012
U.S. Savings Plan [Member]
Dec. 31, 2011
U.S. Savings Plan [Member]
Dec. 29, 2012
2020 And Thereafter [Member]
Dec. 29, 2012
Discretionary [Member]
Dec. 29, 2012
Nondiscretionary [Member]
Dec. 31, 2011
Nondiscretionary [Member]
Dec. 29, 2012
Related to Lump Sum Payments [Member]
Defined Benefit Plan Disclosure [Line Items]                          
Lower limit of net accumulated gain or loss   10.00%                      
Average remaining service period of active plan participants, pension expense   11 years                      
Average remaining service period of active plan participants, retiree medical expense   8 years                      
Pre-tax curtailment gain       $ 62                  
Unfunded plans included in total projected benefit liability   761                      
Expected future employer contributions in 2013   240 17                    
Expected long-term rate of return on U.S. plan assets   7.80%                      
Pension strategy investment term, years   5 years                      
Employer contributions   1,614     251 110       1,375     405
Contribution retiree medical plan   70         109 144   140 111 110  
Average increase in the cost of covered retiree medical benefits   7.00%                      
Average increase is then projected to decline                 5.00%        
Discretionary contribution to fund pension settlement 405                        
Pre-tax non-cash settlement charge 195                        
Pre-tax non-cash settlement charge, after-tax $ 131                        
Pre-tax non-cash settlement charge, net of tax, per share $ 0.08