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Retirement Programs - Pension and Postretirement Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]                  
Curtailment gain               $ (9)  
Settlement charges   $ 6 $ 40 $ 51         $ 0
Amount recognized in Net pension and OPEB cost (benefit), excluding service cost             $ (177) (32) (4)
Termination charge               17  
Defined Benefit Plan, Benefit Obligation, Payment for Settlement       $ 91          
Pensions                  
Defined Benefit Plan Disclosure [Line Items]                  
Service cost             150 142 74
Interest cost             208 261 128
Expected return on plan assets             (482) (462) (219)
Net amortization and deferral             90 61 71
Curtailment gain             0 8 0
Settlement charges $ 6       $ 10 $ 4 6 97 14
Amount recognized in Net pension and OPEB cost (benefit), excluding service cost             (178) (35) (6)
Settlement gains from divestitures             0 0 (44)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total             (28) 107 24
OPEB                  
Defined Benefit Plan Disclosure [Line Items]                  
Service cost             2 2 2
Interest cost             5 7 5
Expected return on plan assets             0    
Net amortization and deferral             (4) (4) (3)
Curtailment gain             0 0 0
Settlement charges             0    
Amount recognized in Net pension and OPEB cost (benefit), excluding service cost             1 3 2
Settlement gains from divestitures             0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total             3 5 $ 4
Defined Benefit Plan, Benefit Obligation, Payment for Settlement             $ 0 $ 0