Retirement and Other Employee Benefits - Pension and Postretirement Health Care Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Amortization of:
Settlement loss	$ 21	$ 0	$ 46	$ 0
Postretirement Health Care Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	1	1	3	3
Expected return on plan assets	(3)	(2)	(9)	(7)
Amortization of:
Unrecognized net loss	2	1	4	4
Unrecognized prior service benefit	(4)	(7)	(12)	(20)
Settlement loss	0	0	0	0
Net periodic pension cost (benefit)	(4)	(7)	(14)	(20)
U.S. | Pension Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	46	46	138	138
Expected return on plan assets	(57)	(55)	(172)	(165)
Amortization of:
Unrecognized net loss	11	9	33	27
Unrecognized prior service benefit	0	0	0	0
Settlement loss	0	0	0	0
Net periodic pension cost (benefit)	0	0	(1)	0
Non-U.S. | Pension Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2	3	6
Interest cost	10	13	30	41
Expected return on plan assets	(24)	(23)	(71)	(71)
Amortization of:
Unrecognized net loss	4	3	12	9
Unrecognized prior service benefit	0	0	0	0
Settlement loss	21	0	46	0
Net periodic pension cost (benefit)	$ 12	$ (5)	$ 20	$ (15)