Restructuring Charges - Summary of Restructuring Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 134	$ 229	$ 0
NextGen Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	134	229
Employee separation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	85	115
Employee separation costs | NextGen Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	85	115
Facility exit costs | NextGen Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	36	108
Lease restructuring	23	71
Accelerated depreciation	13	36
Impairment of long-lived		1
Third party and other costs | NextGen Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 13	$ 6