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Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 02, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Benefit Obligation, Divestiture $ 99        
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement $ 1,700        
Other Postretirement Benefit Plans          
Defined Benefit Plan Disclosure [Line Items]          
Service cost   $ 13 $ 13 $ 26 $ 26
Interest cost   11 14 22 29
Expected return on plan assets   (20) (19) (39) (37)
Amortization of unrecognized prior service credit   (25) (22) (50) (45)
Termination benefits   37 0 37 0
Curtailments   (27) 0 (28) (1)
Net periodic benefit cost   (11) (14) (32) (28)
U.S. | Pension Plans          
Defined Benefit Plan Disclosure [Line Items]          
Service cost   98 88 198 175
Interest cost   106 109 202 217
Expected return on plan assets   (191) (195) (379) (388)
Amortization of unrecognized prior service credit   (11) (12) (20) (25)
Net loss amortization   58 76 142 152
Termination benefits   52 1 53 4
Curtailments   9 0 16 2
Settlements   0 9 0 9
Net periodic benefit cost   121 76 212 146
International | Pension Plans          
Defined Benefit Plan Disclosure [Line Items]          
Service cost   87 73 179 146
Interest cost   30 33 59 68
Expected return on plan assets   (104) (101) (209) (205)
Amortization of unrecognized prior service credit   (4) (3) (9) (6)
Net loss amortization   38 31 78 62
Termination benefits   2 0 3 1
Curtailments   (27) 0 (27) (1)
Settlements   2 2 2 2
Net periodic benefit cost   $ 24 $ 35 $ 76 $ 67