Pension and Postretirement Benefit Plans - Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Pension Plan [Member] | U.S. [Member] | Qualified [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	157	149	472	450
Expected return on plan assets	(222)	(259)	(667)	(783)
Amortization of:
Actuarial losses	37	30	110	90
Prior service costs/(credits)	(1)	0	(2)	1
Curtailments	0	1	0	11
Settlements	1	38	3	84
Special termination benefits	3	0	4	0
Defined benefit plan, net periodic benefit cost	(25)	(40)	(80)	(147)
Pension Plan [Member] | International [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	31	33	94	104
Interest cost	53	52	162	160
Expected return on plan assets	(79)	(89)	(239)	(274)
Amortization of:
Actuarial losses	20	25	61	77
Prior service costs/(credits)	(1)	(1)	(3)	(3)
Curtailments	0	(4)	0	(4)
Settlements	12	0	12	0
Special termination benefits	0	0	0	1
Defined benefit plan, net periodic benefit cost	37	17	88	61
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	12	14	37	40
Expected return on plan assets	0	0	0	0
Amortization of:
Actuarial losses	2	3	7	10
Prior service costs/(credits)	0	0	(1)	(1)
Curtailments	0	1	0	1
Settlements	22	3	21	24
Special termination benefits	5	0	14	0
Defined benefit plan, net periodic benefit cost	41	20	78	75
Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	10	28	29
Interest cost	19	18	57	54
Expected return on plan assets	(8)	(9)	(25)	(28)
Amortization of:
Actuarial losses	0	2	2	5
Prior service costs/(credits)	(43)	(45)	(132)	(135)
Curtailments	(47)	(1)	(47)	(15)
Settlements	(10)	0	(10)	0
Special termination benefits	1	0	2	0
Defined benefit plan, net periodic benefit cost	$ (78)	$ (26)	$ (124)	$ (89)