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Retirement Benefits (Tables)
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Schedule of net periodic benefit costs The components of net periodic benefit cost related to pension benefits for the three and six months ended June 30, 2021 and 2020 were as follows:
 Three Months Ended June 30,
20212020
Dollars in millionsUnited StatesInt’lUnited StatesInt’l
Components of net periodic pension cost (benefit)
Interest cost$$$— $
Expected return on plan assets(1)(22)(1)(14)
Amortization of prior service cost— — 
Recognized actuarial loss— 
Net periodic benefit cost (benefit)$— $(5)$— $
 Six Months Ended June 30,
20212020
Dollars in millionsUnited StatesInt’lUnited StatesInt’l
Components of net periodic pension cost (benefit)
Interest cost$$16 $$19 
Expected return on plan assets(2)(43)(2)(29)
Amortization of prior service cost— — 
Recognized actuarial loss16 11 
Net periodic pension cost (benefit)$— $(10)$— $