v3.26.1
Employee Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Pension Benefits    
Net periodic benefit costs [Abstract]    
Service costs $ 37 $ 37
Interest costs 118 119
Expected return on plan assets (113) (110)
Amortization of net actuarial (gains) losses 38 42
Amortization of prior service costs (credit) (2) (3)
Net periodic benefit costs (credit) 78 85
Other Postretirement Benefits    
Net periodic benefit costs [Abstract]    
Service costs 0 1
Interest costs 11 11
Expected return on plan assets (7) (14)
Amortization of net actuarial (gains) losses (11) (8)
Amortization of prior service costs (credit) (1) 0
Net periodic benefit costs (credit) $ (8) $ (10)