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Employee Benefits (Tables)
3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost The components of net periodic benefit cost for our retirement plans and postretirement plans for the three months ended March 31 are as follows: 
(in millions)20212020
Service cost$$
Interest cost10 13 
Expected return on assets(26)(26)
Amortization of prior service credit / actuarial loss
Net periodic benefit cost$(11)$(8)