Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		$ 931,000,000			$ 931,000,000
Amounts reclassified from AOCI	$ 0		$ 0		0	$ 0
Other comprehensive income (loss)	10,000,000		(17,000,000)		14,000,000	$ (40,000,000)
Spin-Off of NCR Atleos		0	$ 23,000,000	$ 2,000,000
Ending balance	867,000,000				867,000,000
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(469,000,000)			(469,000,000)
Other comprehensive income (loss) before reclassifications					14,000,000
Amounts reclassified from AOCI					0
Other comprehensive income (loss)					14,000,000
Spin-Off of NCR Atleos					16,000,000
Ending balance	(439,000,000)				(439,000,000)
Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(468,000,000)			(468,000,000)
Other comprehensive income (loss) before reclassifications					14,000,000
Amounts reclassified from AOCI					0
Other comprehensive income (loss)					14,000,000
Spin-Off of NCR Atleos					16,000,000
Ending balance	(438,000,000)				(438,000,000)
Changes in Employee Benefit Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(1,000,000)			(1,000,000)
Other comprehensive income (loss) before reclassifications					0
Amounts reclassified from AOCI					0
Other comprehensive income (loss)					0
Spin-Off of NCR Atleos					0
Ending balance	(1,000,000)				(1,000,000)
Changes in Fair Value of Effective Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		$ 0			0
Other comprehensive income (loss) before reclassifications					0
Amounts reclassified from AOCI					0
Other comprehensive income (loss)					0
Spin-Off of NCR Atleos					0
Ending balance	$ 0				$ 0