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Employee Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Benefits        
Net periodic benefit costs [Abstract]        
Service costs $ 37 $ 41 $ 112 $ 122
Interest costs 119 114 357 342
Expected return on plan assets (111) (115) (332) (345)
Amortization of net actuarial (gains) losses 42 42 126 125
Amortization of prior service costs (credit) (3) (3) (9) (9)
Net periodic benefit costs (credit) 84 79 254 235
Other Postretirement Benefits        
Net periodic benefit costs [Abstract]        
Service costs 0 0 2 2
Interest costs 11 10 32 30
Expected return on plan assets (6) (14) (27) (42)
Amortization of net actuarial (gains) losses (17) (7) (40) (21)
Amortization of prior service costs (credit) 0 0 0 0
Net periodic benefit costs (credit) $ (12) $ (11) $ (33) $ (31)