INFORMATION ON BUSINESS SEGMENTS - FAS/CAS Pension Adjustment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2021	Mar. 29, 2020
Segment Reporting Information [Line Items]
Non-operating FAS pension income	$ 93	$ 55
Net FAS/CAS pension adjustment	582	524
Segment Reconciling Items
Segment Reporting Information [Line Items]
Less: CAS pension cost	516	494
FAS pension service cost	(27)	(25)
FAS/CAS operating adjustment	489	469
Qualified defined benefit pension plans
Segment Reporting Information [Line Items]
FAS pension income	(66)	(30)
FAS pension service cost	(27)	(25)
Qualified defined benefit pension plans | Qualified Plan
Segment Reporting Information [Line Items]
FAS pension income	$ 66	$ 30