INFORMATION ON BUSINESS SEGMENTS - FAS/CAS Pension Adjustment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Non-operating FAS pension cost	$ (145)	$ (199)	$ (433)	$ (597)
Net FAS/CAS pension adjustment	368	252	1,104	756
Segment reconciling items
Segment Reporting Information [Line Items]
Less: CAS pension cost	642	608	1,924	1,825
FAS pension service cost	(129)	(157)	(387)	(472)
FAS/CAS operating adjustment	513	451	1,537	1,353
Qualified defined benefit pension plans
Segment Reporting Information [Line Items]
FAS pension expense/service cost	274	356	820	1,069
FAS pension service cost	(129)	(157)	(387)	(472)
Qualified defined benefit pension plans | Qualified Plan
Segment Reporting Information [Line Items]
FAS pension expense/service cost	(274)	(356)	(820)	(1,069)
Non-operating FAS pension cost	$ (30)	$ (16)	$ (87)	$ (49)