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Post-retirement Benefit Plans (Textuals) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block        
Employer contribution to defined benefit plan     $ 20 $ 15
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 $ 3   $ 3