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Retirement Programs - Schedule of Pension and OPEB Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]            
Curtailment and termination benefits     $ (7)      
Net pension and OPEB cost (benefit) $ (41) $ 2     $ (131) $ (7)
Termination charge     $ 17      
Benefits paid       $ 91    
Pensions            
Defined Benefit Plan Disclosure [Line Items]            
Service cost 38 34     111 112
Interest cost 52 61     154 194
Expected return on plan assets (122) (117)     (360) (349)
Net amortization and deferral 22 17     67 45
Curtailment and termination benefits 0 0     0 10
Settlement charge 6 40   51 6 91
Net pension and OPEB cost (benefit) (42) 1     (133) (9)
Net periodic benefit cost (benefit) (4) 35     (22) 103
After-tax pension settlement charges 5     $ 38    
OPEB            
Defined Benefit Plan Disclosure [Line Items]            
Service cost 1 0     2 1
Interest cost 1 3     4 6
Expected return on plan assets 0 0     0 0
Net amortization and deferral   (2)     (2) (4)
Curtailment and termination benefits 0 0     0 0
Settlement charge 0 0     0 0
Net pension and OPEB cost (benefit) 1 1     2 2
Net periodic benefit cost (benefit) $ 2 $ 1     $ 4 $ 3