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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2021
Employee-related Liabilities [Abstract]  
Components of Net Periodic Benefit Cost The Company's net periodic benefit cost includes the following components for the three months ended March 31 (in millions):
Pension BenefitsOther Postretirement BenefitsAffected Line Item
in the Statements of
 Consolidated Operations
2021202020212020
Service cost$60 $54 $2 $2 Salaries and related costs
Interest cost46 56 6 7 Miscellaneous, net
Expected return on plan assets(71)(91)— — Miscellaneous, net
Amortization of unrecognized (gain) loss 43 35 (7)(11)Miscellaneous, net
Amortization of prior service credit— — (31)(31)Miscellaneous, net
Special termination benefits— — 46 — Miscellaneous, net
Other— 3 — — Miscellaneous, net
Total$78 $57 $16 $(33)
Information Related to Share-Based Compensation The table below presents information related to share-based compensation (in millions):
Three Months Ended March 31,
20212020
Share-based compensation expense$34 $18 
March 31, 2021December 31, 2020
Unrecognized share-based compensation$203 $88