BUSINESSES HELD FOR SALE AND DISCONTINUED OPERATIONS - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2018	Nov. 13, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets planned to be disposed of		$ 20,000
Held for Sale, Not Discontinued Operation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cumulative pre-tax loss on the planned disposals	$ 1,132
Cumulative loss on planned disposals, net of tax	1,087
Held for Sale, Not Discontinued Operation \| Power \| Industrial Solutions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Liquidation of valuation allowance	546
Pre-tax gain on disposal	238
After-tax gain recognized	13
Consideration received	$ 2,420

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Disposal Group, Including Discontinued Operation, Cumulative Gain (Loss), Before Income Tax

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Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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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.

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