| Schedule of Results by Segment |
| | | | | | | | | | | | | For the year ended | 2023 | 2022 | 2021 | | | | | | Revenue | | | | | CNBU | $ | 5,710 | | $ | 13,693 | | $ | 12,280 | | | MBU | 3,630 | | 7,260 | | 7,203 | | | EBU | 3,637 | | 5,235 | | 4,209 | | | SBU | 2,553 | | 4,553 | | 3,973 | | | All Other | 10 | | 17 | | 40 | | | $ | 15,540 | | $ | 30,758 | | $ | 27,705 | | | | | | | Operating income (loss) | | | | | CNBU | $ | (585) | | $ | 5,844 | | $ | 4,295 | | | MBU | (1,750) | | 2,160 | | 2,173 | | | EBU | 382 | | 1,752 | | 1,006 | | | SBU | (1,887) | | 513 | | 173 | | | All Other | 8 | | 12 | | 20 | | | (3,832) | | 10,281 | | 7,667 | | | | | | | Unallocated | | | | | Provision to write down inventories to net realizable value | (1,831) | | — | | — | | | Lower costs from sale of inventory written down in prior periods | 844 | | — | | — | | | Stock-based compensation | (564) | | (501) | | (395) | | | Inventory accounting policy change to FIFO | — | | — | | (133) | | | Change in inventory cost absorption | — | | — | | (160) | | | 3D XPoint inventory write-down | — | | — | | (49) | | | Restructure and asset impairments | (171) | | (48) | | (488) | | Goodwill impairment | (101) | | — | | — | | | Litigation settlement | (68) | | — | | — | | | Patent license charges | — | | — | | (128) | | | Other | (22) | | (30) | | (31) | | | (1,913) | | (579) | | (1,384) | | | | | | Operating income (loss) | $ | (5,745) | | $ | 9,702 | | $ | 6,283 | |
Depreciation and amortization expense included in operating income (loss) was as follows: | | | | | | | | | | | | | For the year ended | 2023 | 2022 | 2021 | | | | | | CNBU | $ | 2,512 | | $ | 2,766 | | $ | 2,497 | | | MBU | 2,149 | | 1,725 | | 1,553 | | | EBU | 1,324 | | 1,280 | | 1,028 | | | SBU | 1,751 | | 1,323 | | 1,101 | | | All Other | 1 | | 2 | | 8 | | | Unallocated | 19 | | 20 | | 27 | | | $ | 7,756 | | $ | 7,116 | | $ | 6,214 | |
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