Retirement and Other Employee Benefits - Pension and Postretirement Health Care Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Postretirement Health Care Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	1	1
Expected return on plan assets	(3)	(3)
Amortization of:
Unrecognized net loss	1	1
Unrecognized prior service benefit	(4)	(4)
Net periodic pension benefit	(5)	(5)
U.S. | Pension Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	51	46
Expected return on plan assets	(69)	(68)
Amortization of:
Unrecognized net loss	12	14
Unrecognized prior service benefit	0	0
Net periodic pension benefit	(6)	(8)
Non-U.S. | Pension Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1
Interest cost	10	10
Expected return on plan assets	(21)	(24)
Amortization of:
Unrecognized net loss	4	3
Unrecognized prior service benefit	0	0
Net periodic pension benefit	$ (6)	$ (10)