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POSTRETIREMENT BENEFIT PLANS - Schedule of Pretax Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 25, 2018
Qualified defined benefit pension plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 129	$ 157
Interest cost	452	435
Expected return on plan assets	(575)	(599)
Recognized net actuarial losses	351	444
Amortization of prior service credits	(84)	(81)
Total net periodic benefit cost	273	356
Retiree medical and life insurance plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	4	5
Interest cost	24	23
Expected return on plan assets	(28)	(34)
Recognized net actuarial losses	1	1
Amortization of prior service credits	10	4
Total net periodic benefit cost	$ 11	$ (1)

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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