v3.26.1
Employee Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Pension Benefits        
Net periodic benefit costs [Abstract]        
Service costs $ 38 $ 38 $ 75 $ 75
Interest costs 119 119 237 238
Expected return on plan assets (112) (111) (225) (221)
Amortization of net actuarial (gains) losses 39 42 77 84
Amortization of prior service costs (credit) (2) (3) (4) (6)
Net periodic benefit costs (credit) 82 85 160 170
Other Postretirement Benefits        
Net periodic benefit costs [Abstract]        
Service costs 2 1 2 2
Interest costs 12 10 23 21
Expected return on plan assets (8) (7) (15) (21)
Amortization of net actuarial (gains) losses (11) (15) (22) (23)
Amortization of prior service costs (credit) 0 0 (1) 0
Net periodic benefit costs (credit) $ (5) $ (11) $ (13) $ (21)