Employee Benefit Plans - PAC (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1	$ 1
Interest cost	7	7
Expected return on plan assets	(8)	(8)
Net amortization	(1)	(1)
Net periodic benefit credit	(1)	(1)
U.S. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	4
Interest cost	26	28
Expected return on plan assets	(31)	(31)
Net amortization	2	4
Net periodic benefit credit	0	0
PAC | Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	3	3
Expected return on plan assets	(3)	(3)
Net amortization	(1)	(1)
Net periodic benefit credit	(1)	(1)
PAC | U.S. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	9	10
Expected return on plan assets	(12)	(12)
Net amortization	2	3
Net periodic benefit credit	$ (1)	$ 1