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Employee Benefits (Tables)
 9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Net Pension Cost (Benefit) for All Funded and Unfunded Plans The components of net pension cost (benefit) for all funded and unfunded plans are recorded in Other expense and are summarized in the following table. For more information on our Pension Plans and Other Postretirement Benefit Plans, see Note 18 (“Employee Benefits”) beginning on page 164 of our 2020 Form 10-K.
 Three months ended September 30,Nine months ended September 30,
Dollars in millions2021202020212020
Interest cost on PBO$6 $9 $18 $26 
Expected return on plan assets(7)(10)(21)(29)
Amortization of losses5 5 14 13 
Settlement loss7 — 7 8 
Net pension cost$11 $4 $18 $18