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DISCONTINUED OPERATIONS - Major Categories of Income (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax |  | $ (2) | $ 1,113 | $ 18 | $ 31 | $ (47) | $ 138 | $ 104 | $ 111 | $ 1,160 | $ 306 | $ 428
Net income (loss) attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 | 0 | (1)
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  | 1,160 | 306 | 429
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Digital Banking |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 457 | 579 | 547
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | 84 | 77 | 73
Research and development expenses |  |  |  |  |  |  |  |  |  | 37 | 46 | 31
Total operating expenses |  |  |  |  |  |  |  |  |  | 373 | 446 | 398
Income from discontinued operations |  |  |  |  |  |  |  |  |  | 84 | 133 | 149
Other income (expense), net |  |  |  |  |  |  |  |  |  | (48) | (5) | 0
Income (loss) from discontinued operations before gain on sale of business and income taxes |  |  |  |  |  |  |  |  |  | 36 | 128 | 149
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 388 | 13 | 11
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  | 1,178 | 115 | 138
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Digital Banking Segment |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of business | $ 1,500 |  |  |  |  |  |  |  |  | 1,530 | 0 | 0
Income (loss) from discontinued operations before income taxes |  |  |  |  |  |  |  |  |  | 1,566 | 128 | 149
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Spin-Off of Atleos |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 5 | 3,321 | 4,123
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  | 1 | 540 | 461
Research and development expenses |  |  |  |  |  |  |  |  |  | 0 | 52 | 70
Total operating expenses |  |  |  |  |  |  |  |  |  | 5 | 2,976 | 3,733
Income from discontinued operations |  |  |  |  |  |  |  |  |  | 0 | 345 | 390
Interest expense |  |  |  |  |  |  |  |  |  | 0 | (6) | 0
Other income (expense), net |  |  |  |  |  |  |  |  |  | 0 | (22) | (11)
Income (loss) from discontinued operations before income taxes |  |  |  |  |  |  |  |  |  | 0 | 317 | 379
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  | 8 | 76 | 85
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  | (8) | 241 | 294
Net income (loss) attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 | 0 | (1)
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  | (8) | 241 | 295
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Product | Digital Banking |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 38 | 53 | 55
Costs of products and services |  |  |  |  |  |  |  |  |  | 31 | 43 | 38
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Product | Spin-Off of Atleos |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 0 | 802 | 1,092
Costs of products and services |  |  |  |  |  |  |  |  |  | 0 | 651 | 956
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Service | Digital Banking |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 419 | 526 | 492
Costs of products and services |  |  |  |  |  |  |  |  |  | 221 | 280 | 256
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Service | Spin-Off of Atleos |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  | 5 | 2,519 | 3,031
Costs of products and services |  |  |  |  |  |  |  |  |  | $ 4 | $ 1,733 | $ 2,246

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