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SUPPLEMENTAL FINANCIAL INFORMATION - Other Non-Current Assets (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022
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Supplemental Financial Information [Abstract] |  |  |
Equity investments | $ 2,005 | $ 2,187 |
Inventories | 523 | 484 |
Operating leases | 1,326 | 1,220 |
Pension and postretirement | 299 | 285 |
Research and development | 485 | 496 |
Restricted cash | 0 | 54 |
Other | 230 | 214 |
Other non-current assets | $ 4,868 | $ 4,940 |
Restricted cash for contributions and settlements |  |  | $ 210

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