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Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Pension Plans [Member]    
Components of net periodic benefit cost:    
Service cost $ 28 $ 28
Interest cost 31 30
Expected return on plan assets (53) (50)
Amortization of:    
Net actuarial gain (1) (2)
Prior service credit (3) (5)
Net periodic benefit cost 2 1
Other Postretirement Benefit Plans [Member]    
Components of net periodic benefit cost:    
Service cost 1 1
Interest cost 3 3
Expected return on plan assets 0 0
Amortization of:    
Net actuarial gain (1) (1)
Prior service credit 0 (1)
Net periodic benefit cost $ 3 $ 2