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EMPLOYEE RETIREMENT PLANS - Pre-tax Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pre-tax expense      
Pre-tax expense $ 84 $ 92 $ 84
Defined-benefit pension plans      
Pre-tax expense      
Pre-tax expense 29 34 32
Defined-contribution plans      
Pre-tax expense      
Pre-tax expense $ 55 $ 58 $ 52