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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - POSTRETIREMENT AND OTHER BENEFIT PLANS (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Aug. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
POST RETIREMENT AND OTHER BENEFIT PLANS |  |  |  |
Total benefit costs, including postretirement costs |  | $ 182 | $ 181 | $ 182
Decrease to benefit obligation | $ 178 |  |  |

X
- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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X
- Definition Amount of cost (reversal of cost) for other postretirement benefits. Excludes pension benefits. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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