POSTRETIREMENT BENEFIT PLANS - Narrative (Details) $ / shares in Units, satellite in Thousands		3 Months Ended		9 Months Ended
	Aug. 03, 2021 USD ($) satellite	Sep. 26, 2021 USD ($) $ / shares	Sep. 27, 2020 USD ($)	Sep. 26, 2021 USD ($) $ / shares	Sep. 27, 2020 USD ($)	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Recognition of previously deferred postretirement benefit plan amounts, before tax		$ 137,000,000	$ 140,000,000	$ 492,000,000	$ 420,000,000
Recognition of previously deferred postretirement benefit plan amounts, net of tax		107,000,000	110,000,000	387,000,000	330,000,000
Outstanding pension benefit obligations and related plan assets	$ 4,900,000,000
Non-cash, non-operating pension settlement charge		1,700,000,000		1,700,000,000
Non-cash, non-operating pension settlement charge, after tax		$ 1,300,000,000		$ 1,300,000,000
Non-cash, non-operating pension settlement charge, per share, after Tax (in dollars per share) | $ / shares		$ 4.72		$ 4.72
Qualified defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation, discount rate	2.75%					2.50%
Change in benefit obligation due to remeasurement				$ 1,253,000,000
Company contributions		$ 0	0	0	0
Qualified defined benefit pension plans | Qualified Plan
Defined Benefit Plan Disclosure [Line Items]
Outstanding pension benefit obligations and related plan assets	$ 4,900,000,000
Number of retirees and beneficiaries | satellite	18
Decrease in defined benefit plan, remeasurements	$ 2,900,000,000
Change in benefit obligation due to remeasurement	1,300,000,000
Increase in defined benefit plan, pension plan assets, incremental return	1,600,000,000
Defined benefit pension plans resulted	$ 2,300,000,000
Qualified defined benefit pension plans | Qualified Plan | Minimum
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation, discount rate	6.50%
Qualified defined benefit pension plans | Qualified Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation, discount rate	7.00%
Retiree medical and life insurance plans
Defined Benefit Plan Disclosure [Line Items]
Recognition of previously deferred postretirement benefit plan amounts, before tax		$ 6,000,000	$ 4,000,000	$ 13,000,000	$ 14,000,000