Pension and Postretirement Benefit Plans - Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Pension Plan [Member] | U.S. [Member] | Qualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	131	157	262	315
Expected return on plan assets	(251)	(223)	(503)	(445)
Amortization of:
Actuarial losses	32	37	64	74
Prior service credits	(1)	(1)	(1)	(2)
Settlements	6	2	20	2
Special termination benefits	0	1	0	1
Defined benefit plan, net periodic benefit cost	(83)	(27)	(159)	(55)
Pension Plan [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	36	31	72	63
Interest cost	40	54	82	109
Expected return on plan assets	(75)	(80)	(153)	(160)
Amortization of:
Actuarial losses	30	20	62	41
Prior service credits	(1)	(1)	(1)	(2)
Settlements	1	0	2	0
Special termination benefits	0	0	0	0
Defined benefit plan, net periodic benefit cost	32	25	63	51
Supplemental Employee Retirement Plan [Member] | U.S. [Member] | Non-Qualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	8	12	18	25
Expected return on plan assets	0	0	0	0
Amortization of:
Actuarial losses	4	2	7	5
Prior service credits	0	0	0	0
Settlements	6	0	44	0
Special termination benefits	1	3	2	9
Defined benefit plan, net periodic benefit cost	19	17	71	37
Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	9	19	19
Interest cost	13	19	25	38
Expected return on plan assets	(9)	(8)	(18)	(16)
Amortization of:
Actuarial losses	0	1	0	2
Prior service credits	(43)	(45)	(86)	(89)
Settlements	0	0	0	0
Special termination benefits	0	1	0	1
Defined benefit plan, net periodic benefit cost	$ (30)	$ (23)	$ (60)	$ (46)