SUPPLEMENTAL FINANCIAL INFORMATION - Other Non-Current Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Supplemental Financial Information [Abstract]
Equity investments	$ 2,713	$ 4,076
Inventories	909	1,080
Operating leases	919	859
Pension and postretirement	317	208
Research and development	248	206
Restricted cash	197	338
Other	232	252
Other non-current assets	$ 5,535	$ 7,019

Equity investments - Non-current

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Research and development - Non-Current

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Supplemental Financial Information [Abstract]

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Inventories not expected to be converted to cash, sold or exchanged within the normal operating cycle.

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Amount of lessee's right to use underlying asset under operating lease.

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Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer.

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Amount of noncurrent assets classified as other.

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Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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