Employee Benefit Plans - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2023
Postemployment Retirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan assets contributions by employer		$ 7		$ 30
Expected future benefit payment, remainder of fiscal year		75		75
Total estimated contributions by employer during fiscal year		45		45
Postretirement Plan | United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan assets contributions by employer		0		0
Expected future benefit payment, remainder of fiscal year		2		2
Total estimated contributions by employer during fiscal year		2		2
Total Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (income)		21	$ (9)	23	$ (28)
Total Pension Benefits | Foreign Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (income)		(4)	(2)	(5)	(8)
Plan assets contributions by employer		5		13
Expected future benefit payment, remainder of fiscal year		4		4
Total estimated contributions by employer during fiscal year		17		17
Total Pension Benefits | United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (income)		25	$ (7)	$ 28	$ (20)
Plan assets contributions by employer		$ 6
Total Pension Benefits | United States | NCR Atleos Corporation
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions required, percent of annual costs				50.00%
Contributions by spinoff, threshold				$ 40
Total Pension Benefits | United States | Forecast
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total estimated contributions by employer during fiscal year						$ 150
Contributions by spinoff company	$ 136
Total Pension Benefits | United States | Subsequent Event
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan assets contributions by employer	$ 8