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Retirement Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Retirement Plans      
Percentage of eligible compensation contributed by employer to Retirement Account Plan 2.00%    
Additional percentage of eligible compensation contributed annually by employer to defined contribution plan for employees hired after January 1, 2010 4.00%    
Cost recognized for defined contribution plans $ 88 $ 85 $ 88
Portion of contribution related to Retirement Account Plan 21 23 25
Other changes in plan assets and benefit obligations recognized in OCI      
Current year actuarial loss (gain) 417 542 197
Amortization of prior service credit (cost) (2) (15) (11)
Pension Benefits
     
Net periodic benefit cost      
Service cost 119 129 124
Interest cost 305 327 328
Expected return on plan assets (407) (393) (385)
Amortization of prior service cost (credit) 16 16 16
Amortization of net actuarial loss 118 75 41
Curtailment and special termination charges   (1) 2
Net periodic benefit cost 151 153 126
Other changes in plan assets and benefit obligations recognized in OCI      
Current year actuarial loss (gain) 402 556 171
Current year prior service cost (credit)   7 5
Amortization of net actuarial loss (118) (75) (41)
Amortization of prior service credit (cost) (16) (16) (16)
Curtailments and settlements   1 (1)
Total recognized in OCI, before taxes 268 473 118
Total recognized in net periodic benefit cost and OCI 419 626 244
Postretirement Benefits Other than Pensions
     
Net periodic benefit cost      
Service cost 6 8 8
Interest cost 25 33 34
Amortization of prior service cost (credit) (11) (8) (4)
Amortization of net actuarial loss 7 11 11
Net periodic benefit cost 27 44 49
Other changes in plan assets and benefit obligations recognized in OCI      
Current year actuarial loss (gain) 15 (17)  
Current year prior service cost (credit) (2) (23) (16)
Amortization of net actuarial loss (7) (11) (11)
Amortization of prior service credit (cost) 11 8 4
Total recognized in OCI, before taxes 17 (43) (23)
Total recognized in net periodic benefit cost and OCI $ 44 $ 1 $ 26