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SUPPLEMENTAL FINANCIAL INFORMATION - Other Non-Current Assets (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022
--- | --- | --- | ---
Supplemental Financial Information [Abstract] |  |  |
Equity investments | $ 1,991 | $ 2,187 |
Inventories | 720 | 484 |
Operating leases | 1,274 | 1,220 |
Pension and postretirement | 298 | 285 |
Research and development | 470 | 496 |
Restricted cash | 0 | 54 |
Other | 269 | 214 |
Other non-current assets | $ 5,022 | $ 4,940 |
Restricted cash for contributions and settlements |  |  | $ 210

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