Pension and Postretirement Benefit Plans - Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 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	393	472
Expected return on plan assets	(251)	(222)	(754)	(667)
Amortization of:
Actuarial losses	32	37	96	110
Prior service credits	(1)	(1)	(2)	(2)
Curtailments	0	0	0	0
Settlements	171	1	191	3
Special termination benefits	0	3	0	4
Net periodic benefit cost/(credit) reported in income	82	(25)	(77)	(80)
Pension Plan [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	36	31	108	94
Interest cost	40	53	122	162
Expected return on plan assets	(75)	(79)	(228)	(239)
Amortization of:
Actuarial losses	31	20	93	61
Prior service credits	(1)	(1)	(2)	(3)
Curtailments	0	0	0	0
Settlements	1	12	2	12
Special termination benefits	0	0	0	0
Net periodic benefit cost/(credit) reported in income	32	37	96	88
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	9	12	26	37
Expected return on plan assets	0	0	0	0
Amortization of:
Actuarial losses	4	2	11	7
Prior service credits	0	0	0	(1)
Curtailments	0	0	0	0
Settlements	3	22	47	21
Special termination benefits	0	5	2	14
Net periodic benefit cost/(credit) reported in income	15	41	85	78
Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	10	9	29	28
Interest cost	13	19	38	57
Expected return on plan assets	(9)	(8)	(27)	(25)
Amortization of:
Actuarial losses	0	0	0	2
Prior service credits	(43)	(43)	(129)	(132)
Curtailments	0	(47)	0	(47)
Settlements	0	(10)	0	(10)
Special termination benefits	0	1	0	2
Net periodic benefit cost/(credit) reported in income	$ (30)	$ (78)	$ (89)	$ (124)