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EMPLOYEE BENEFIT PLANS - Periodic Pension Benefit (Details) - Pension Plan - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 27 $ 29 $ 31
Interest cost 37 52 67
Expected return on plan assets (145) (140) (154)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 2 2 2
Recognized actuarial net loss 32 22 9
Net settlement, curtailment and special termination benefit loss 13 4 4
Total net periodic benefit (income) cost $ (34) $ (31) $ (41)