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Other Income - Net
 12 Months Ended
Dec. 31, 2020
Other Income and Expenses [Abstract]  
Other Income - Net Other Income - Net
The Company derives income from items that are not considered operating activities. Income from these items is reported net of related expense. All components of net periodic pension and post-retirement benefit costs, excluding service cost, are included in other income - net on the consolidated income statement. Miscellaneous income (expense) may fluctuate due to timing and includes investment gains, losses and interest income as well as other non-operating activities. 

    Interest income decreased from 2019 to 2020 primarily as a result of lower interest rates, partially offset by higher average investment balances. Interest income increased from 2018 to 2019 primarily as a result of higher average cash and short-term investment balances. Debt repurchase expense increased from 2019 to 2020 primarily as a result of long-term debt being redeemed earlier relative to maturity date. Other income – net consisted of the following:
 Fiscal Years 
(Dollars in Millions)202020192018
Net Periodic Pension and Post-retirement Benefit Credit (a)
$42 $43 $38 
Interest Income17 48 32 
Debt Repurchase Expense(48)(10)— 
Miscellaneous Income8 7 4 
Total Other Income - Net$19 $88 $74 
(a) Excludes the service cost component of net periodic benefit cost.