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Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Pension Plans [Member]        
Components of net periodic benefit cost:        
Service cost $ 27 $ 27 $ 54 $ 54
Interest cost 33 34 65 68
Expected return on plan assets (57) (56) (115) (111)
Amortization of:        
Net actuarial gain (2) (2) (4) (4)
Prior service cost 1 1 3 3
Settlement loss 0 2 1 3
Net periodic benefit cost 2 6 4 13
Other Postretirement Benefit Plans [Member]        
Components of net periodic benefit cost:        
Service cost 1 1 2 2
Interest cost 2 3 5 6
Expected return on plan assets 0 0 0 0
Amortization of:        
Net actuarial gain (1) (2) (3) (4)
Prior service cost 0 0 0 0
Settlement loss 0 0 0 0
Net periodic benefit cost $ 2 $ 2 $ 4 $ 4