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SUPPLEMENTAL FINANCIAL INFORMATION - Other Non-Current Assets (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023
--- | --- | --- | ---
Supplemental Financial Information [Abstract] |  |  |
Equity investments (Note 9) | $ 1,859 | $ 1,699 |
Operating leases | 1,436 | 1,390 |
Inventories | 951 | 906 |
Pension and postretirement | 290 | 284 |
Research and development | 407 | 413 |
Restricted cash | 2 | 0 |
Receivables and convertible notes | 659 | 436 |
Other | 420 | 242 |
Other non-current assets | $ 6,024 | $ 5,370 |
Restricted cash for contributions and settlements |  |  | $ 53

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