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Retirement Programs - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]    
Pension contributions $ 76 $ 69
Minimum    
Defined Benefit Plan Disclosure [Line Items]    
Required contributions to pension plans for 2020 85  
Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Required contributions to pension plans for 2020 $ 95