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POSTRETIREMENT BENEFIT PLANS - Schedule of Pretax Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2021	Mar. 29, 2020
Qualified defined benefit pension plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 27	$ 25
Interest cost	311	385
Expected return on plan assets	(569)	(566)
Recognized net actuarial losses	252	212
Amortization of prior service credits	(87)	(86)
Total net periodic benefit income	(66)	(30)
Retiree medical and life insurance plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	3	3
Interest cost	13	18
Expected return on plan assets	(35)	(32)
Recognized net actuarial losses	0	(1)
Amortization of prior service credits	9	10
Total net periodic benefit income	$ (10)	$ (2)

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