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Post-retirement Benefit Plans (Textuals) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block        
Employer contribution to defined benefit plan     $ 12 $ 16
Contributions to meet shortfall     5  
Minimum        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block        
Additional contributions $ 7   7  
Maximum        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block        
Other postretirement benefit expense 1 $ 1 1 1
Amortization of net actuarial loss 1 1 1 1
Additional contributions 15   15  
Foreign Plan [Member]        
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block        
Amortization of net actuarial loss $ 4 $ 3 $ 8 $ 6