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RETIREMENT BENEFIT PLANS RETIREMENT BENEFIT PLANS - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employee Benefits [Abstract]      
Benefit plans' expense $ 9 $ 2 $ 10
Discount rates 2.50% 4.50% 4.10%
Rates of compensation 2.80% 3.00% 3.50%