Employee Retirement Plans - Schedule of Net Benefit Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Pension benefits
Service cost	$ 24	$ 23
Interest cost	47	46
Expected return on plan assets	(50)	(48)
Amortization of prior service cost (credit)	1	1
Total pension and postretirement benefit expense (income)	22	22
Postretirement benefits
Service cost	1	1
Interest cost	4	5
Amortization of actuarial net gain	(6)	(5)
Amortization of prior service cost (credit)	(2)	(2)
Total pension and postretirement benefit expense (income)	$ (3)	$ (1)