INFORMATION ON BUSINESS SEGMENTS - FAS/CAS Pension Adjustment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020
Segment Reporting Information [Line Items]
Non-service FAS pension (expense) income	$ (1,572)	$ 54	$ (1,385)	$ 164
Net FAS/CAS pension adjustment	(1,081)	523	84	1,571
Unallocated items
Segment Reporting Information [Line Items]
Less: CAS pension cost	517	494	1,549	1,483
FAS pension service cost	(26)	(25)	(80)	(76)
FAS/CAS operating adjustment	491	469	1,469	1,407
Qualified defined benefit pension plans
Segment Reporting Information [Line Items]
FAS pension (expense) income	1,598	(29)	1,465	(88)
FAS pension service cost	(26)	(25)	(80)	(76)
Qualified defined benefit pension plans | Qualified Plan
Segment Reporting Information [Line Items]
FAS pension (expense) income	$ (1,598)	$ 29	$ (1,465)	$ 88