Pension Benefits (Tables)

6 Months Ended

Jun. 30, 2023

Retirement Benefits [Abstract]

Summary of Net Periodic Benefit Cost

Net periodic benefit costs for our significant defined benefit plans include the following components:

	Three Months Ended June 30,								Six Months Ended June 30,
	U.S. Plans				Non-U.S. Plan				U.S. Plans				Non-U.S. Plan
	2023		2022		2023		2022		2023		2022		2023		2022
	(Dollars in millions)
Service cost	$	—	$	—	$	1	$	2	$	—	$	—	$	3	$	4
Interest cost	2		1		1		1		4		2		2		1
Expected return on plan assets	(2)		(2)		(2)		(1)		(4)		(4)		(4)		(3)
Amortization of prior service (credit)	—		—		—		—		—		—		—		—
	$	—	$	(1)	$	—	$	2	$	—	$	(2)	$	1	$	2