INFORMATION ON BUSINESS SEGMENTS - FAS/CAS Pension Adjustment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Non-operating FAS pension income (expense)	$ 55	$ (144)	$ 110	$ (288)
Net FAS/CAS pension adjustment	524	368	1,048	736
Segment reconciling items
Segment Reporting Information [Line Items]
Less: CAS pension cost	495	641	989	1,282
FAS pension service cost	(26)	(129)	(51)	(258)
FAS/CAS operating adjustment	469	512	938	1,024
Qualified defined benefit pension plans
Segment Reporting Information [Line Items]
FAS pension income (expense)	(29)	273	(59)	546
FAS pension service cost	(26)	(129)	(51)	(258)
Qualified defined benefit pension plans | Qualified Plan
Segment Reporting Information [Line Items]
FAS pension income (expense)	$ 29	$ (273)	$ 59	$ (546)