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Pension Benefits (Tables)
 3 Months Ended
Mar. 31, 2021
Compensation And Retirement Disclosure [Abstract]  
Summary of Net Periodic Benefit Cost

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

 

 

 

Three Months Ended March 31,

 

 

 

U.S. Plans

 

 

Non-U.S. Plan,

 

 

 

2021

 

2020

 

 

2021

 

 

2020

 

 

 

(Dollars in millions)

 

Service cost

 

$

—

 

$

—

 

 

$

3

 

 

$

2

 

Interest cost

 

 

1

 

 

1

 

 

 

—

 

 

 

—

 

Expected return on plan assets

 

 

(3

)

 

(3

)

 

 

(2

)

 

 

(1

)

 

 

$

(2

)

$

(2

)

 

$

1

 

 

$

1