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RETIREMENT AND DEFERRED COMPENSATION PLANS - Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Retirement Benefits [Abstract]  
Effect on service and interest cost components, 1% Increase $ 1
Effect on postretirement benefit obligation, 1% Increase 2
Effect on service and interest cost components, 1% Decrease (1)
Effect on postretirement benefit obligation, 1% Decrease $ (1)