Pension and Other Postretirement Benefits, Net Periodic Benefit Cost (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 29, 2017	Sep. 23, 2016	Sep. 29, 2017	Sep. 23, 2016
Components of net periodic benefit cost [Abstract]
Curtailment loss		$ 2
Pension Plans [Member]
Components of net periodic benefit cost [Abstract]
Service cost		26	$ 25	$ 84	$ 80
Interest cost		35	32	106	101
Expected return on plan assets		(52)	(47)	(158)	(149)
Amortization of prior service credits		1	0	1	0
Amortization of net loss (gains)		14	13	45	39
Curtailment loss	[1]	2	0	2	0
Net periodic benefit cost		26	23	80	71
Postretirement Benefit Plans [Member]
Components of net periodic benefit cost [Abstract]
Service cost		1	0	2	1
Interest cost		2	1	4	4
Expected return on plan assets		(1)	(1)	(3)	(3)
Amortization of prior service credits		(1)	0	(1)	(1)
Amortization of net loss (gains)		(1)	(1)	(2)	(1)
Curtailment loss	[1]	0	0	0	0
Net periodic benefit cost		$ 0	$ (1)	$ 0	$ 0

[1] During the quarterly period ended September 29, 2017, the Company recognized a $2 million pension curtailment loss related severance and restructuring activities in the Aerospace Systems segment.