Discontinued Operations - Major Categories of Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued operations, net of tax	$ 3	$ 30
Net income (loss) attributable to noncontrolling interests of discontinued operations	0	(1)
Income from discontinued operations, net of tax	3	31
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		147
Selling, general and administrative expenses		21
Research and development expenses		13
Total operating expenses		123
Income (loss) from discontinued operations before income taxes		24
Income tax expense (benefit)		(8)
Income from discontinued operations, net of tax		32
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	5
Selling, general and administrative expenses	0	1
Total operating expenses	0	7
Income from discontinued operations	0	(2)
Other income (expense), net	0	(1)
Income (loss) from discontinued operations before income taxes	0	(3)
Income tax expense (benefit)	0	(1)
Income (loss) from discontinued operations, net of tax	0	(2)
Net income (loss) attributable to noncontrolling interests of discontinued operations	0	(1)
Income from discontinued operations, net of tax	0	(1)
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		11
Costs of products and services sold		12
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	1
Costs of products and services sold	0	1
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		136
Costs of products and services sold		77
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	4
Costs of products and services sold	$ 0	$ 5