INVESTMENTS IN UNCONSOLIDATED SUBSIDIARIES AND AFFILIATES - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
Sep. 30, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 534	$ 514
Variable interest entities \| Nanjing Iveco Motor Co.
Schedule of Equity Method Investments [Line Items]
Ownership percentage in equity method investments sold	30.10%
Equity method investments, ownership percentage	19.90%
Realized gain on sale of interest in equity method investment	$ 42
Variable interest entities \| SAIC IVECO Commercial Vehicle Investment Company Limited
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 88	$ 8

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of gain (loss) on sale or disposal of an equity method investment.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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