Pension and Postretirement Benefit Plans - Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Pension Plan [Member] | U.S. [Member] | Qualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	131	157
Expected return on plan assets	(252)	(223)
Amortization of:
Actuarial losses	32	37
Prior service costs/(credits)	(1)	(1)
Settlements	14	1
Special termination benefits	0	0
Defined benefit plan, net periodic benefit cost	(76)	(28)
Pension Plan [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	36	32
Interest cost	42	54
Expected return on plan assets	(78)	(80)
Amortization of:
Actuarial losses	31	20
Prior service costs/(credits)	(1)	(1)
Settlements	1	0
Special termination benefits	0	0
Defined benefit plan, net periodic benefit cost	32	25
Supplemental Employee Retirement Plan [Member] | U.S. [Member] | Non-Qualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	10	12
Expected return on plan assets	0	0
Amortization of:
Actuarial losses	4	2
Prior service costs/(credits)	0	0
Settlements	38	0
Special termination benefits	1	6
Defined benefit plan, net periodic benefit cost	52	20
Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	9
Interest cost	13	19
Expected return on plan assets	(9)	(8)
Amortization of:
Actuarial losses	0	1
Prior service costs/(credits)	(43)	(45)
Settlements	0	0
Special termination benefits	0	0
Defined benefit plan, net periodic benefit cost	$ (30)	$ (23)