Retirement and Other Employee Benefits - Pension and Postretirement Health Care Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Postretirement Health Care Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	1	1	1	1
Expected return on plan assets	(3)	(3)	(5)	(5)
Amortization of
Unrecognized net loss	1	1	2	2
Unrecognized prior service benefit	(4)	(4)	(7)	(7)
Net periodic pension benefits	(5)	(5)	(9)	(9)
U.S. | Pension Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	51	46	102	92
Expected return on plan assets	(69)	(68)	(138)	(136)
Amortization of
Unrecognized net loss	12	14	23	28
Unrecognized prior service benefit	0	0	0	0
Net periodic pension benefits	(6)	(8)	(13)	(16)
Non-U.S. | Pension Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	2	2
Interest cost	10	10	20	20
Expected return on plan assets	(21)	(24)	(42)	(48)
Amortization of
Unrecognized net loss	4	3	8	6
Unrecognized prior service benefit	0	0	0	0
Net periodic pension benefits	$ (6)	$ (10)	$ (12)	$ (20)