Discontinued Operations - Major Categories of Income (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net income (loss) from discontinued operations		$ 1,113	$ 138	$ 1,162	$ 353
Net income (loss) attributable to noncontrolling interests		0	1	0	1
Income from discontinued operations, net of tax		1,113	137	1,162	352
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]
Revenue of business segment sold		156	150	457	429
Selling, general and administrative expenses		39	19	84	56
Research and development expenses		14	10	37	31
Total operating expenses		127	114	373	326
Income from discontinued operations		29	36	84	103
Interest expense		0	0	0	0
Other income (expense), net		(48)	(5)	(48)	(5)
Income (loss) from discontinued operations before gain on sale of business and income taxes		(19)	31	36	98
Gain on sale of business	$ 1,500	1,546	0	1,546	0
Income (loss) from discontinued operations before income taxes		1,527	31	1,582	98
Income tax expense (benefit)		395	(1)	401	(2)
Net income (loss) from discontinued operations		1,132	32	1,181	100
Net income (loss) attributable to noncontrolling interests		0	0	0	0
Income from discontinued operations, net of tax		1,132	32	1,181	100
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]
Revenue of business segment sold		0	1,058	5	3,083
Selling, general and administrative expenses		0	176	1	484
Research and development expenses		0	16	0	46
Total operating expenses		0	884	5	2,731
Income from discontinued operations		0	174	0	352
Interest expense		0	(2)	0	(2)
Other income (expense), net		0	(18)	0	(17)
Income (loss) from discontinued operations before income taxes		0	154	0	333
Income tax expense (benefit)		0	48	0	79
Net income (loss) from discontinued operations		0	106	0	254
Net income (loss) attributable to noncontrolling interests		0	1	0	1
Income from discontinued operations, net of tax		0	105	0	253
Product | 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]
Revenue of business segment sold		15	16	38	37
Costs of products and services sold		9	12	31	30
Product | 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]
Revenue of business segment sold		0	247	0	745
Costs of products and services sold		0	200	0	598
Cost of services | 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]
Revenue of business segment sold		141	134	419	392
Costs of products and services sold		65	73	221	209
Cost of services | 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]
Revenue of business segment sold		0	811	5	2,338
Costs of products and services sold		$ 0	$ 492	$ 4	$ 1,603