INFORMATION ON BUSINESS SEGMENTS - FAS/CAS Pension Adjustment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Segment Reporting Information [Line Items]
Non-operating FAS pension income (expense)	$ 54	$ (145)	$ 164	$ (433)
Net FAS/CAS pension adjustment	523	368	1,571	1,104
Segment Reconciling Items
Segment Reporting Information [Line Items]
Less: CAS pension cost	494	642	1,483	1,924
FAS pension service cost	(25)	(129)	(76)	(387)
FAS/CAS operating adjustment	469	513	1,407	1,537
Qualified defined benefit pension plans
Segment Reporting Information [Line Items]
FAS pension income (expense)	(29)	274	(88)	820
FAS pension service cost	(25)	(129)	(76)	(387)
Qualified defined benefit pension plans | Qualified Plan
Segment Reporting Information [Line Items]
FAS pension income (expense)	$ 29	$ (274)	$ 88	$ (820)