OTHER OPERATING EXPENSE, NET - Other Operating Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Income and Expenses [Abstract]
Restructuring expense	$ 51	$ 20	$ 143	$ 72
Merger, acquisition and divestiture expense	8	16	36	58
Loss on sale	0	0	7	0
Asset impairments	0	0	0	17
Net gain on insurance recovery for property damage	(1)	(3)	(3)	(9)
Other income, net	(4)	(4)	(10)	(5)
Other operating expense, net	$ 54	$ 29	$ 173	$ 133

Transaction related expenses including merger, acquisition and divestiture

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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- Definition

The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire.

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The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation.

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The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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