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Pension, Retiree Medical and Savings Plans (Selected Financial Information for Pension and Retiree Medical Plans) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Pension Plans, Defined Benefit      
Change in fair value of plan assets      
Employer contributions/funding $ 162 $ 591 $ 200
United States Pension Plan of US Entity, Defined Benefit      
Change in projected benefit liability      
Liability at beginning of year 13,409 11,825  
Service cost 435 393 467
Interest cost 546 580 527
Plan amendments 16 (122)  
Experience (gain)/loss (583) 1,635  
Benefit payments (808) (349)  
Settlement/curtailment gain   (577)  
Special termination benefits 18 24  
Liability at end of year 13,033 13,409 11,825
Change in fair value of plan assets      
Fair value at beginning of year 12,224 11,462  
Actual return on plan assets (85) 1,254  
Employer contributions/funding 66 434  
Benefit payments (808) (349)  
Defined Benefit Plan, Settlements, Plan Assets   (577)  
Fair value at end of year 11,397 12,224 11,462
Funded status (1,636) (1,185)  
Amounts recognized      
Other assets   97  
Other current liabilities (47) (42)  
Other liabilities (1,589) (1,240)  
Net amount recognized (1,636) (1,185)  
Amounts included in accumulated other comprehensive loss (pre-tax)      
Net loss/(gain) 3,065 2,918  
Prior service cost/(credit) 1 (18)  
Total 3,066 2,900  
Components of the increase/(decrease) in net loss/(gain) included in accumulated other comprehensive loss      
Change in discount rate (593) 1,424  
Employee-related assumption changes (35) 345  
Liability-related experience different from assumptions 51 (104)  
Actual asset return different from expected return 935 (470)  
Amortization and settlement of losses (205) (316)  
Other, including foreign currency adjustments (6) (30)  
Total 147 849  
Accumulated benefit obligation at end of year 12,077 12,206  
International      
Change in projected benefit liability      
Liability at beginning of year 3,247 2,859  
Service cost 99 98 111
Interest cost 115 131 118
Plan amendments 1    
Participant contributions 2 3  
Experience (gain)/loss (221) 512  
Benefit payments (89) (86)  
Settlement/curtailment gain (19) (25)  
Special termination benefits 1    
Foreign currency adjustment (264) (245)  
Liability at end of year 2,872 3,247 2,859
Change in fair value of plan assets      
Fair value at beginning of year 3,002 2,777  
Actual return on plan assets 77 401  
Employer contributions/funding 96 157  
Benefit payments (89) (86)  
Defined Benefit Plan, Settlements, Plan Assets (16) (24)  
Foreign currency adjustment (249) (226)  
Fair value at end of year 2,823 3,002 2,777
Funded status (49) (245)  
Amounts recognized      
Other assets 56 37  
Other current liabilities (1) (1)  
Other liabilities (104) (281)  
Net amount recognized (49) (245)  
Amounts included in accumulated other comprehensive loss (pre-tax)      
Net loss/(gain) 733 1,003  
Prior service cost/(credit) (7) (7)  
Total 726 996  
Components of the increase/(decrease) in net loss/(gain) included in accumulated other comprehensive loss      
Change in discount rate (150) 636  
Employee-related assumption changes 6 (112)  
Liability-related experience different from assumptions (77) (12)  
Actual asset return different from expected return 97 (225)  
Amortization and settlement of losses (77) (61)  
Other, including foreign currency adjustments (69) (72)  
Total (270) 154  
Accumulated benefit obligation at end of year 2,453 2,721  
Retiree Medical Plan      
Change in projected benefit liability      
Liability at beginning of year 1,439 1,384  
Service cost 35 36 45
Interest cost 52 58 54
Plan amendments   (125)  
Experience (gain)/loss (115) 190  
Benefit payments (102) (101)  
Special termination benefits 1 3  
Foreign currency adjustment (10) (6)  
Liability at end of year 1,300 1,439 1,384
Change in fair value of plan assets      
Fair value at beginning of year 415 406  
Actual return on plan assets (2) 46  
Employer contributions/funding 43 64 62
Benefit payments (102) (101)  
Fair value at end of year 354 415 $ 406
Funded status (946) (1,024)  
Amounts recognized      
Other current liabilities (63) (57)  
Other liabilities (883) (967)  
Net amount recognized (946) (1,024)  
Amounts included in accumulated other comprehensive loss (pre-tax)      
Net loss/(gain) (138) (49)  
Prior service cost/(credit) (127) (166)  
Total (265) (215)  
Components of the increase/(decrease) in net loss/(gain) included in accumulated other comprehensive loss      
Change in discount rate (42) 98  
Employee-related assumption changes (37) 58  
Liability-related experience different from assumptions (36) 34  
Actual asset return different from expected return 29 (19)  
Amortization and settlement of losses (2) 4  
Other, including foreign currency adjustments (1) (2)  
Total $ (89) $ 173