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Pensions and Other Postretirement Benefits (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Jul. 01, 2012
Jul. 03, 2011
Retirement Plans [Member]
        
Components of net periodic benefit cost        
Service cost $ 168 $ 144 $ 329 $ 287
Interest cost 219 214 441 427
Expected return on plan assets (308) (277) (620) (555)
Amortization of prior service cost/ (credit) 0 1 2 4
Amortization of net transition obligation 0 1 0 1
Recognized actuarial losses 124 98 248 194
Curtailments and Settlements 0 0 (1) 0
Net periodic benefit cost 203 181 399 358
Other Benefit Plans [Member]
        
Components of net periodic benefit cost        
Service cost 45 37 89 74
Interest cost 41 46 82 94
Expected return on plan assets (1) (1) (2) (1)
Amortization of prior service cost/ (credit) (1) 0 (2) (1)
Amortization of net transition obligation 0 0 0 0
Recognized actuarial losses 20 12 38 23
Curtailments and Settlements 0 0 0 0
Net periodic benefit cost $ 104 $ 94 $ 205 $ 189