INFORMATION ON BUSINESS SEGMENTS - FAS/CAS Pension Adjustment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Non-operating FAS pension income (expense)	$ 55	$ (144)
Net FAS/CAS pension adjustment	524	368
Segment reconciling items
Segment Reporting Information [Line Items]
Less: CAS pension cost	494	641
FAS pension service cost	(25)	(129)
FAS/CAS operating adjustment	469	512
Qualified defined benefit pension plans
Segment Reporting Information [Line Items]
FAS pension income (expense)	(30)	273
FAS pension service cost	(25)	(129)
Qualified defined benefit pension plans | Qualified Plan
Segment Reporting Information [Line Items]
FAS pension income (expense)	$ 30	$ (273)