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Pension and Postretirement Benefit Plans - Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
 3 Months Ended
Apr. 04, 2021
Mar. 29, 2020
Pension Plan [Member] | U.S. [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 0 $ 0
Interest cost 113 141
Expected return on plan assets (261) (252)
Amortization of prior service credits (1) (1)
Actuarial (gains)/losses (47) 163
Special termination benefits 7 1
Net periodic benefit cost/(credit) reported in income (187) 53
Pension Plan [Member] | International [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 33 36
Interest cost 36 42
Expected return on plan assets (82) (81)
Amortization of prior service credits 0 (1)
Actuarial (gains)/losses 0 3
Special termination benefits 0 0
Net periodic benefit cost/(credit) reported in income (12) (1)
Postretirement Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 9 10
Interest cost 7 13
Expected return on plan assets (10) (9)
Amortization of prior service credits (39) (43)
Actuarial (gains)/losses 0 0
Special termination benefits 1 0
Net periodic benefit cost/(credit) reported in income $ (32) $ (30)