Restructuring Programs - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 64
Payments for restructuring	33	$ 47
Restructuring related reserve	4		$ 4
HCL/TCS
Restructuring Cost and Reserve [Line Items]
Payments for restructuring	$ 0	$ 19