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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 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 March 31,
in millions20212020
Interest cost on PBO$6 $9 
Expected return on plan assets(7)(10)
Amortization of losses5 4 
Settlement loss— 4 
Net pension cost$4 $7