Pension and Other Postretirement Benefits, Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2019	Mar. 30, 2018
Pension Plans [Member]
Components of net periodic benefit cost [Abstract]
Service cost	$ 6	$ 26
Interest cost	40	36
Expected return on plan assets	(49)	(56)
Amortization of prior service credits	(1)	0
Amortization of net loss (gains)	11	19
Curtailment loss	2	0
Net periodic benefit cost	9	25
Postretirement Benefit Plans [Member]
Components of net periodic benefit cost [Abstract]
Service cost	1	0
Interest cost	1	1
Expected return on plan assets	(1)	(1)
Amortization of prior service credits	0	0
Amortization of net loss (gains)	(1)	(1)
Curtailment loss	0	0
Net periodic benefit cost	0	$ (1)
C&NS [Member] | Pension Plans [Member]
Components of net periodic benefit cost [Abstract]
Curtailment loss	$ 2