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Post-retirement Benefit Plans (Textuals) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block    
Employer contribution to defined benefit plan $ 4 $ 5
Maximum    
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block    
Other postretirement benefit expense 1 1
Amortization of net actuarial loss 1 $ 1
Additional contributions 32  
Minimum    
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block    
Additional contributions $ 28