Restructuring - Restructuring Expenses Included in Consolidated Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Restructuring Cost and Reserve [Line Items]
Restructuring	$ 27	$ 33
Strategic and Operational Efficiency Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring	27	33
Cost incurred to date	180
Employee Severance And Other Restructuring Charges | Strategic and Operational Efficiency Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring	25	31
Cost incurred to date	171
Real estate related costs | Strategic and Operational Efficiency Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring	1	2
Cost incurred to date	5
Internally developed software-related charges | Strategic and Operational Efficiency Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring	1	$ 0
Cost incurred to date	$ 4