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Retirement Plans - Net Periodic Benefit Cost (Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 28, 2024
Dec. 30, 2023
Dec. 31, 2022
Other changes in plan assets and benefit obligations recognized in OCI      
Current year actuarial loss (gain) $ (568) $ 102 $ (285)
Amortization of net actuarial gain (loss) 5 7 (83)
Amortization of prior service credit (cost) (8) (8) (8)
Cost associated with defined the defined contribution component 164 154 140
Pension Benefits      
Net periodic benefit cost (income)      
Service cost 69 67 108
Interest cost 362 364 272
Expected return on plan assets (635) (610) (609)
Amortization of prior service cost (credit) 9 11 13
Amortization of net actuarial loss (gain) 3 1 87
Net periodic benefit cost (income) (192) (167) (129)
Other changes in plan assets and benefit obligations recognized in OCI      
Current year actuarial loss (gain) (561) 109 (246)
Current year prior service cost 19 7 4
Amortization of net actuarial gain (loss) (3) (1) (87)
Amortization of prior service credit (cost) (9) (11) (13)
Total recognized in OCI, before taxes (554) 104 (342)
Total recognized in net periodic benefit cost (income) and OCI (746) (63) (471)
Pension Benefits | United States      
Other changes in plan assets and benefit obligations recognized in OCI      
Cost associated with defined the defined contribution component 10 11 11
Postretirement Benefits Other than Pensions      
Net periodic benefit cost (income)      
Service cost 1 2 2
Interest cost 7 8 6
Expected return on plan assets 0 0 0
Amortization of prior service cost (credit) (1) (3) (5)
Amortization of net actuarial loss (gain) (8) (8) (4)
Net periodic benefit cost (income) (1) (1) (1)
Other changes in plan assets and benefit obligations recognized in OCI      
Current year actuarial loss (gain) (7) (7) (39)
Current year prior service cost 0 0 0
Amortization of net actuarial gain (loss) 8 8 4
Amortization of prior service credit (cost) 1 3 5
Total recognized in OCI, before taxes 2 4 (30)
Total recognized in net periodic benefit cost (income) and OCI $ 1 $ 3 $ (31)