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POSTRETIREMENT BENEFIT PLANS - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 24, 2018	Jun. 30, 2019	Jun. 24, 2018
Defined Benefit Plan Disclosure [Line Items]
Recognition of previously deferred postretirement benefit plan amounts, before tax	$ 288,000,000	$ 381,000,000	$ 577,000,000	$ 763,000,000
Recognition of previously deferred postretirement benefit plan amounts, net of tax	227,000,000	300,000,000	454,000,000	600,000,000
Retiree medical and life insurance plans
Defined Benefit Plan Disclosure [Line Items]
Recognition of previously deferred postretirement benefit plan amounts, before tax	9,000,000	15,000,000	20,000,000	29,000,000
Qualified defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Material contributions to qualified defined benefit pension plans	$ 0	$ 2,000,000,000.0	$ 0	$ 3,500,000,000

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