PENSION AND OTHER POSTRETIREMENT BENEFITS (Details 7) - Contribution Plan - USD ($) $ in Millions  | 
12 Months Ended | ||
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Dec. 31, 2018  | 
Dec. 31, 2017  | 
Dec. 31, 2016  | 
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| Other Pension Plan | |||
| Defined Contribution Plan Disclosure [Line Items] | |||
| Defined Contribution Plan, Cost | $ 104 | $ 84 | $ 68 | 
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- Definition Amount of cost for defined contribution plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Details 
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