Retirement Plans (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2021	Oct. 03, 2020	Oct. 02, 2021	Oct. 03, 2020
Pension Benefits
Net periodic benefit cost (credit)
Service cost	$ 29	$ 27	$ 87	$ 79
Interest cost	62	73	188	220
Expected return on plan assets	(143)	(144)	(431)	(431)
Amortization of net actuarial loss	39	47	116	139
Amortization of prior service cost	4	3	10	9
Net periodic benefit cost (credit)	(9)	6	(30)	16
Pension Benefits | United States
Net periodic benefit cost (credit)
Defined contribution component	2	2	8	8
Postretirement Benefits Other Than Pensions
Net periodic benefit cost (credit)
Service cost	1	0	2	2
Interest cost	1	2	4	6
Amortization of net actuarial loss	(1)	(1)	(2)	(1)
Amortization of prior service cost	(2)	(1)	(4)	(4)
Net periodic benefit cost (credit)	$ (1)	$ 0	$ 0	$ 3