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EMPLOYEE RETIREMENT PLANS - Amounts in Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Amounts in the company's consolidated balance sheets
Accrued liabilities	$ (182)	$ (41)
Qualified
Amounts in the company's consolidated balance sheets
Other assets	1	1
Accrued liabilities	(135)	(1)
Other liabilities	(121)	(254)
Total net liability	(255)	(254)
Non-Qualified
Amounts in the company's consolidated balance sheets
Other assets	0	0
Accrued liabilities	(12)	(13)
Other liabilities	(150)	(148)
Total net liability	$ (162)	$ (161)

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